Hey guys it's me. Sorry but had some things and totally forgot to update my stories. So as saying sorry, here is a Ben 10/ Naruto Harem crossover. Most of the characters will be gender swapped but it'll be the same.

I don't own Ben 10 or Naruto.

Ben's Ninja Harem

Chapter 1: A World of Ninjas

Location: Bellwood, Ben Prime universe

Ben was feeling bored as usual. But he was also feeling sad on the inside. He found out his girlfriend, Julie, was moving to Japan because her dad got a great job there. At first, the first weeks, they tried to make use of a long distance relationship but it was too much so they decided to see other people. Ben took hard but knew it was for the best, though they continue as friends.

Ben still continues to be a hero that the people know him as, though he was still bored and sad. Ben and his partner, Rook Blonko, were at a Mr Smoothy stand enjoying the weekend off from the intergalactic peacekeepers, the Plumbers. Ben still had a weird feeling something was gonna happen.

"Ben," Rook said to his partner in crime, "is something the matter?"

"Maybe. I just got a weird something's gonna happen." Ben said

"You're just paranoid." Rook said as his monitor beeped. "Looks like I'm getting called to work."

"Great. Let's go!" Ben said enthusiastically but Rook held his hand out.

"Sorry, Ben. They're just calling me." Rook told Ben.

"What?! Come on!" Ben said angrily but knew his partner was just a call.

"This is Rook Blonko calling in. What is happening?" Room asked.

"There's a diplomatic meeting on Revonnah. We need you to go there and resolve it." Max Tennyson, Ben's grandpa, told Rook.

"What about me, Grandpa?" Ben asked the communicator.

"Sorry, Ben. This is something only Rook can do for us right now." Max told Ben.

Ben sighed as he knew his grandpa was right. Ben said goodbye to his partner as he continued to drink his cherry-limeade smoothie. Just as he did that, he saw a portal open up.

"Well, this is weird." He said as he walked to the portal. He thought Paradox might have done this, but the professor wasn't here.

"Maybe I shouldn't be this close. But it might lead to somewhere." And so he got too close and weird electrical tentacles grabbed him by his limbs. He was surprised and now trying to get free.

"This was a bad idea…" he screamed as he went through the portal.

?

Ben groaned as he awoke from being unconscious. He felt something soft under him and felt grass.

"Well, at least I landed somewhere soft." Ben got and saw a river going by. Going through dimensional portals can bring someone to be needing water. Ben scooped some in his hands and drank.

"Now I just got figure out where I am."

"The question is a really good one for this situation." A voice from behind said. Ben turned around and saw someone he needed right now: Professor Paradox.

"Paradox. Please say you have a good reason I'm here." Ben asked the 1950 dress doctor.

"Yes I do. This world is in danger." He said simply.

"Ok. And what's this world now?" Ben asked his time walker comrade.

"Tell me, Benjamin. Do you know what ninjas are?" He asked.

"Who doesn't?" Ben said.

"Well, this world is inhabited by the very warriors you like to watch in movies and television. But it's different here." He said.

"How?" Ben needed to know.

"Well, it's like this. This world has many major villages of shinobi. Many years ago, demons known as tailed beasts ravaged this land."

Ben was hearing in detail of this history.

"They were behemoths of monsters based on chakra, the lifeforce of this world. And one of these beasts, the Nine-Tailed Fox, destroyed a village but was defeated by the Fourth Hokage."

"Hokage?" This world was new to Ben.

"Think of president and that's it's." He simplified.

"Oh." Ben answered.

"Yes. Anyway, for the nine-tails to be stopped, he sealed it in a child but in the process giving his life to do it. His friend from his younger days was the original container but she was killed along with him." He said solemnly.

"Oh no." Ben said.

"Yes. And the regretful part was he sealed it in his only daughter."

"WHAT! Why the hell would he do that?!" Ben shouted.

"He found that because of him being the strongest shinobi and the hokage, with his wife being a part of her family's clan, the child had strong chakra levels to contain. But he asked his sensei and the third Hokage to look after the child."

"He has no right! That's just mess up!" Ben told his friend time-walker friend.

"He had no choice. But the good news is that she is now a full fledge kunoichi or female ninja." He said calmly.

"Ok. What has this got to do with me?" Ben asked.

"The bad news… is the girl's future. She will live as the holder of the beast but will live and die alone. That's where you come in. If you can change her future, than you can stop the madness of this world." Paradox finished his explanation.

"Wait. What?" Ben asked but was shot down by the time walker.

"Hurry you need to get to the village immediately. But before that, i have a surprise." He smiled at Ben as he held out his mechanical arm.

"What surprise?" Ben said.

"Do you remember that Slimebiote on your omnitrix a while back?" Asked Paradox.

"Skurd? I'm almost forgot about him." Ben answered his friends question.

"Well, that seems a little rude, don't you think my boy?" A familiar voice rang from the closed glove.

"No way. Is that..?" Ben asked as he couldn't believe who it was.

"Benjamin, I'd like you to see and remember your old omnitrix partner." He said as he opened his hand to reveal a certain slimebiote.

"It is I, Skurd the Slimebiote, at your service again my dear boy." Skurd said as he was revealed to Ben.

"Skurd! But how?" Ben asked.

"I went to the Contemelia about your mission and Skurd wanted to help you again. So they let him go to help you in this world." Paradox explained.

Skurd then jumped from his glove to the omnitrix, where the symbol was on his forehead again.

"Ah, it feels good to be back." Skurd exclaimed happily.

"Yeah. Ok, then let's get to it." Ben said as he was ready for this world.

"Right you are, Ben. But first, can you change into Cannonbolt first?" Paradox asked him.

"Uh, sure. No problem." Ben said as he activated the watch to pick the icon, then the cord opened and in a flash of green, transformed into Cannonbolt.

(A/N: from Ultimate Alien, not Omniverse.) he then looked at the professor.

"Ok, what now?" He asked in his deep voice, then felt the ground not under him. He looked down and saw the clues and the village. Then in the world of Looney Tunes, he screamed as he fell down.

"Whyyyyyy?" He asked as he fell.

"Sorry, this is the fastest way!" He helped to him. "Don't forget to roll into your ball form!" And with that paradox was gone.

Cannonbolt then went into his ball and was falling down fast.

"Why do these things happens to me?!" He screamed as he fell faster.

"I could be asking the same thing!" Skurd yelled along with him.

If only they knew what was below them.

*Below, in Konoha*

They village of Konoha was getting ready for its annual festival. It was the anniversary of the defeat of the Nine-Tails and the death of the Fourth Hokage.

Going about their lives, a blonde haired blue eyed girl was getting chase by a mob of ignorant people. She had a black and orange jumpsuit that didn't helped much to her medium sized chest, big bubble backside and long and strong legs.

Today was her birthday and as usual the ANBU guard tried to help her.

"Naruko, please come back. We can protect you." A guard with a bear mask said.

"No! You'll hurt me like those idiots after me too!" Naruko said as she was still running.

"Dog! Tiger! Try and stop those villagers now!" The bear mask guard told two other guards with tiger and dog masks.

As she was running, she tripped and fell to the ground, despite being a full fledge kunoichi of Konoha.

"There she is!" A voice said as Naruko looked and saw her friends, Sakura Haruno, Hinata Hyuuga, Ino Yamanaka, Choji Akimichi, Hana and Kiba Inuzuka and Shikamaru Nara. Sasuke was nowhere to be found.

The shinobi and village friends of her stand to guard her.

"Get out of our way! That is the demon you're protecting!" The mob leader yelled to the others.

"She's our friend! We won't let you hurt her!" Ino yelled back.

"Fine! Well just break you apart and get it ourselves!" He said as the mob went in closer as the academy graduates went to a fighting stance.

But as they were ready to fight, they heard someone yelled from the sky.

"Look out below!" The voice as everyone saw what looked like a meteor fall down to the street.

"Naruko, get out of here!" Choji said to her.

"What?" She asked but it was too late as the meteor crashed down, creating a huge dust cloud that can be seen from miles.

*Hokage's Office*

The homage was doing some paperwork when he heard a crash and went to his windows to see.

"What in the world?" He asks himself. He then ordered two ANBU guards to see what happened.

"Minato. Please forgive me." He said to his surrogate granddaughters father as he let out a few tears.

*Back with everyone*

Naruko came out from her hiding place to see what hit the ground. She went in closer knowing the mob might be there. What she saw weirded her a bit.

The meteor was a huge yellow ball! She heard it groaned and started talking.

"Skurd, are you alright?" A deep voice said as another voice answered.

"Yes, I'm quite alright. But on a side note: let's never do that again." The second said.

"Yeah, you're right." The deep voice said as the started to unroll itself. Everyone was surprised by what they saw.

The ball transformed into a stubby human-like being. It had yellow broad shoulders, with the same armor on its back, hands, and legs. It's palms were flat and its legs were small and stubby. It had no head and it's eyes and mouth were on its body. It also had a black line going down its mouth and between its green eyes that had the same color lines around its eyes. It bore a strange hourglass symbol on its stomach with a green squid creature on it with the same symbol.

The creature than said, "Oh, my back hurts like getting punched by a Tetramand."

"Oh, you're fine. This armor can protect you." The squid creature said.

"Yeah, but…" the armored creature stopped as he was getting looks from the people he's seeing.

"Uh oh." He said cautiously. "Uh, hi everybody. Names Cannonbolt. Sorry for "dropping in" on ya. Haha." Cannonbolt tried to make a bad joke, but got one laugh from a blonde haired blue eyed girl.

"Hahaha! "Dropping in" now that's funny." She continued to laugh.

"Heh. Thanks." Cannonbolt thanked her but now got looks from the mob behind him.

"Ben, my dear boy. I think we need to leave." The green booger said.

"Yeah. We could do that. Or…" He turned the symbol to something that looked like a dinosaur. "He could do this!" He exclaimed as he hit the symbol and in a flash of green, turned into a 12 foot tall dinosaur!

It had a brown hide with a tan underbelly. It has a tail and big hands and feet with no claws. It's head was elongated and it had green eyes. The symbol was displayed on his chest.

"Humungousaur!" Humungousaur yelled as he looked down at the mob. "You guys just made a humongous mistake."

And with that, the mob tried to hurt the creature but couldn't penetrate the hide.

"Skurd, old friend, what can you give me right now?" He asked the Slimebiote.

"How about a little taydenite, dear friend?" Skurd asked as he spread across Humungousaur's left hand, giving it a cyan colored crystal fist.

"Thanks." He said as he reeled back his fist and punched the ground under the mob. It shook them and made them lose their balance.

"Take that, you ruffians." Skurd told them as he shook his tentacle at them. Humungousaur turned back to Naruko and, being as careful as he can be, helped her up.

"T-Thank you, ." Naruko said nervously.

"Thanks, but this is not who I am." He said to her

"Then who are you?" Naruko asked as he was about to say who he was the mob got back up.

"How about after we get away fro the mob? Time for the need for speed." Humungousaur joker as he slapped the symbol and again in another green flash turned into another weird creature.

It was a velociraptor-like being with a pointed tail and balls on its feet. It had a white underbelly and blue stripes on its tail. It also had a pointed black helmet and its face was blue with green eyes with black lines around the eyes and had a black-line mouth with a x-shaped visor that was blue. The symbol was on its chest with the green slime creature on it.

"XLR8!" It said in a deep voice. "Time to go!" He said as he picked up Naruko and closed his visor, than in a flash of dust, ran through the mob.

"Whoa! Look at him go!" Choji said.

"Yeah, but he grabbed Naruko!" Ino said.

"I thinks he protecting her!" Sakura thought.

"Then let's keep the this mob from getting to them!" Shikamaru said as they went to face the mob.

*with XLR8 and Naruko*

XLR8 was carrying Naruko at full speed through the village, but had some trouble figuring out the roads.

"Sorry! Coming through!" He said as he went past people on the street.

"Wait!" Naruko said to him. "We need to get to the Hokage Tower!" He told him.

"Where is it?" He asked as she pointed to a building by a monument that looked like Mt. Rushmore but with different peoples heads on it.

"It's there, the Hokage monument!" She said.

"Hey! That looks like Mt. Rushmore!" XLR8 exclaimed.

"Yes! But without the presidents heads on it!" Skurd said as he was waving his tentacles up.

"What?" Naruko asked but saw what was ahead. "Look out!" She yelled as he came to a halt.

"What? What happened?" XLR8 asked as he saw what was in front: an army of mask ninjas and an old man wearing a white ceremonial robe, a red shirt and a white and red hat.

"Gramps!" Naruko yelled as she went and hugged the old man.

"Naruko! By kami you're safe!" He then looked at the velociraptor creature.

"Surround the creature now!" The head ANBU said as dozens of ninja surround XLR8.

"Wait!" The old man said. "He saved Naruko. We must take him from the populace." He finished as the ninjas dispersed.

"So? I'm guessing you're the head honcho of this place?" XLR8 asked.

"The what?" He asked.

"He means are you the Hokage of this village, right my dear boy?" Skurd asked his partner in crime.

"Yeah, that's right." He finished as the old man looked at him and smiled.

"Yes. I am Hiruzen Sarutobi, the Third Hokage of Konoha. And you are?" He asked Ben.

"XLR8's the name. And speed is my game." He gloated of his skills.

"And I am Skurd the Slimebiote." Skurd introduces himself.

"Well why don't you follow me and we'll discuss what to do." Hiruzen said as he walked to the tower and XLR8 followed.

*inside the tower*

Hiruzen, Naruko, and XLR8 were walking in the office. The Hokage sat down and looked at the being infront of him.

"Now that we're out if the streets, can you change into your true form?" He asked as XLR8's eyes widen.

"Um...ok." He said as he slapped the symbol and in a flash of green, turned into a human boy! They didn't expect this.

The boy was around Naruko's age with messy brown hair, emerald green eyes and had some handsome features that made her blush. He was wearing a black shirt with green lines on the sleeve and a green line going down the middle withthe number 10 in the center, brown pants with many pockets and green and white shoes. He had a green and white wristwatch with the same symbol and Skurd was on it.

"My name is Ben. Ben Tennyson and this is Skurd." Ben introduced himself and Skurd.

"At your service." Skurd bowed.

Hiruzen blinked as this young man addressed his name and never heard of such a name, but was happy to know he was a kind-hearted young man. Naruko, meanwhile, was staring at him with a blush on her whispered face. She thought he was super handsome and couldn't think of something to say.

"Ahem." Hiruzen cleared to get rid of the silence. "So, Ben Tennyson, where are you from?"

"Well, that's a little complicated. Do you want a full explanation or short version of myself and what I do?" Ben asked the old Hokage.

"How about the long version?" Asked Hiruzen which surprised Ben.

"Ok. Where to begin?" Ben asked himself. "Well, I am not from around here."

"Yes, I see by how you dress and how you talk." Hiruzen said.

"What I mean is, me and him," He pointed to Skurd, "are from another universe."

"Really?" Naruko asked excitedly, to which Ben nodded.

"Yeah, and in my universe, it's more advanced in technology and with having alien species living on my earth. I'm my universe's greatest hero."

"Hmm. You're your worlds hero." Hiruzen asked skeptically.

"Yeah, and I've been a hero since I was ten." Ben said, shocking both Naruko and the Hokage.

"How?"

"By using this. It's called the Omnitrix." He showed his watch and Skurd was hanging about.

"That little watch? Impossible." He said simply.

"Well, not this one. This is an updated version of the prototype I used when I was ten. It has the DNA of about a million alien species." Ben explained, smiling at the twos facial shock expressions. Then Naruko was excited with this boy.

"So, mind showing us some of these aliens? Pwetty pwease?" Naruko asked cutely with puppy dog eyes, something Ben couldn't turn away from.

"Um...sure. Just let me find one. It's hard to choose." He said as he went scrolling through the list. Then he found the perfect one. And with what he picked, a strange hourglass core popped and he slammed the core back, and in a flash of green, turned into a different creature.

It was a tall red four-armed creature. It had markings on its face to give the appearance of a circus muscle man, it wore gloves on its four hands, and wore a green and black muscle shirt and black pants that were connected by its two toed feet. It had a belt with the Omnitrix and Skurd on it.

The two gazed up at its presence.

"Four Arms!" The creature yelled. "Aw, man. I was going for Diamondhead." It said in a deep voice.

"Wow! This is awesome!" Naruko said then ran up to him and was asking him a bunch of questions. "So, are you really in this form? Can you live up anything heavy? Oh, wait. Can you punch hard?" She was gonna ask more but Hiruzen had one question for him.

"So, what is this form called?" He asked Four-Arms.

"This alien is a Tetramand." Four-Arms explained. "Tetramands are one of the strongest aliens in my universe. I call this guy Four-Arms."

"Interesting. What else can you change into?" The Third Hokage asked Ben.

"Watch and see." He simply said as he slapped the Omnitrix and in another flash of light turned into a new creature.

The new creature appeared to be a dog-ape alien. It had orange fur, no eyes, gills, large arms with large hands and claws and strong legs. It has a green and white collar with the Omnitrix and Skurd on it.

"RAWWWR!" It roared as it was done transforming. The dog creature was sniffing around and now sat on the spot he sniffed. He tongue was hanging out.

"What is this form?" Hiruzen asked as he studied the creature's behavior like that of a dog.

"I'll speak." Slurs called out. "This creature is known as a Vulpimancer. But to him this form is called Wildmutt. They are known for their great sense and hearing, with it the nature of a dog. He can't speak in this form."

"Why not?" Naruko curiously asked.

"The Vulpimancer's language is so garbled up, the omnitrix can't translate what they are saying." Skurd explained.

"Hmm. Interesting." Hiruzen said to himself.

"But, the omnitrix has a special function that can help him talk." Skurd said, grabbing the two's attention.

"Really?! Cool! Let's see it!" Naruko said happily.

"Ben?" Skurd asked the transformed hero, getting a growl as an answer and, with surprise, Wildmutt slapped the Omnitrix again, this time getting four prongs from the device as green light revolves around Wildmutt, Channing into something else.

When the light was gone, what they surprised them. It was Wildmutt, but with maroon-red fur, four large interlacing spikes going down its back, a tail with a horn on it, and the collar expanding around his neck with the evolved Omnitrix and Skurd on it.

"Ultimate Wildmutt!" Ultimate Wildmutt roared as he talked in a deep voice. "Now you can hear what I say in this form."

"How? How can you speak?" Hiruzen asked unknowingly.

"This is a special function known as the Evolution function. Whenever I slap the omnitrix, I can evolve my aliens to their ultimate form. Think of it as having more power than ever." Ultimate Wildmutt explained. Hiruzen looked at this as a good advantage. With having more power, these "ultimate" forms can be a good asset to help him.

Naruko just stared at him with amazement. Then let out a high pitch squeal and hugged the last he dog creature.

"Are you ticklish?" Naruko asked as U. Wildmutt was not liking where this was heading. Then out of nowhere, she scratched the Vulpimancers stomach.

"Who's a good doggy? Who's a good doggy?" She asked the now happy Vulpimancer as his leg was now scratching his side. He let out a low growl and was now getting too comfortable.

"S-stop s-scrat-thing m-me, p-please." U. Wildmutt asked her. She did stop and let him stand up.

"Why do girls do that to the poor creatures?" Skurd asked.

"Beats me." U. Wildmutt said.

"How about one more?" Naruko pleaded.

"Ok." U. Wildmutt said as he slapped the the omnitrix again and in one last blinding strand of light, turned into a new creature.

It was a child size creature. It was black and green, and it had fins on its head. It wore a jumpsuit with black parts on it. It had gems on its arms and belt. The omnitrix rested on its forehead with Skurd on top of it.

"Ditto!" it said as it looked at itself. "Was going for for EchoEcho, but this works too."

"Why do you look like a child?" The Third Hokage asked.

"Huh? Oh. Well, i don't know really. Ditto's species are small to hide from predators and such. Plus, back on my world, from what I got, many fangirls think Ditto is one of my cutest aliens." Ditto explained as he turned his head said under his breath," aside from Pesky Dust."

"Oh, yes. Your Nemuina transformation. How hilarious." Skurd laughed to himself andDitto glared at the slimebiote.

Hiruzen thought and seeing that Naruko was gleaming with excitement,a horrible thought came to mind.

"Ben," he said to the alien, " what exactly can this do?" Hiruzen asked nervously.

"Oh. Ditto can make clones." He explained as he cloned himself and two Dittos stood there. "Tada!"

"So what's better than one?' Ditto prime said.

"How 'bout two." Ditto 2 finished.

"Ben, I think it's time for you to run." Hiruzen told Ben.

"Why?" Both asked as they turned and saw NAruko with a toothy smile and looking at them like all his fangirls did when they saw him as Ditto or Pesky Dust. "Oh." they gulped as she let out a high-pitched squeal.

Hiruzen saw this and stopped her, for as long he could. "Run! I can't hold her for much longer!" he yelled as he was struggling.

"AAAAAHHHH!" they both yelled as they ran like bats out of hell. But that didn't go long as he lost his grip and she ran after them.

"May Kami have mercy on you, Ben." He said he sat back down, not knowing what's gonna happen to this world.

Hey guys, sorry if this is alittle long, but this s my newest fic. As always leave good reviews and such

This is mil the fic writer, new name, out.