A/N

So...I was playing Blaze Blue cross tag battle and had this idea, if it goes well this will replace Remnants magic. Sorry but it's...very difficult to get 4 things for 4 people and I'm gonna try to dial it back a little.

Harry's original world is in time with the real world, so it was 2019 when he 'died'

Don't own Harry Potter, Blaze Blue, or RWBY

A sixteen year old Harry Potter stood side by side with his Godfather, Sirius Black. For the last few years he had lived with his godfather who...honestly was an escaped convict, even if he was innocent of all his crimes and had never been accused of his crimes. After he broke out he had ran from the Dursley's and lived with his godfather, even though his headmaster bitched about it constantly he refused to go back to those monsters. Sirius had been training him for the last three years and he could finally hold his own against those that meant him harm.

Swishing his wand Lucius Malfoy was blasted back and slammed into the wall with a sickening crunch. "Nice one James!" Sirius called. That caused him to lose his grin for a second, Sirius had his moments where he saw his father, not Harry.

Sirius twirled his wand he knocked out the second death eater they were fighting. Suddenly Harry saw Bellatrix Lestrange Blast a spell towards Sirius, "SIRIUS!" He leapt forward and the spell hit him, flinging him back since he wasn't even on the ground. He collided with Sirius and both fell through the veil.

Harry opened his eyes and looked around and found himself in a white mist, "pup..."

Harry whirled around and saw his godfather, "Sirius...where are we?"

"Gone pup. Can't go back now as far as I know."

Harry looked down, "oh..."

"You be a good kid yea?"

Harry looked up wide eyed, "what! But...we're gonna go see my mum and Dad right?"

Sirius shook his head, "from what I understood, something is pulling you away from the other end of the veil. Death gave me one opportunity to say goodbye and give you a gift."

"Sirius! I don't want to go back! I'm ready to go! I'm tired of fighting while everyone abandons me in the end."

Sirius ruffled his hair, "I know kiddo, but it's not to be. Not even death knows what is tugging you away, here's my final gift to you pup. Live a long life wherever you end up and find the love you deserve. Magicae memoria translatio."

Suddenly every bit of magical knowledge that he had collected from his family, and the knowledge that James and Lily had given him rushed into Harry's head and organized itself as Sirius also placed the special memory spells on his mind to protect it that every Black for generations gave to their children. A tug at his Navel forced Harry into a free fall. "SSSSSHHHHHHIIIIITTTTT!"

Sirius laughed, "be good kid. I'm not sure if we'll ever see each other again."

"Thank you Padfoot. That will give him a fighting chance." James said as he walked up. Sirius smiled and suddenly a dog and stag were running off.

Ruby Rose waved off her partner as she ran off to check on something, when she heard a loud scream and a slam into the ground. "Oh my God! Are you ok?"

Be careful Ruby, I have no idea where that one came from. The voice called out. Truth be told the voice was astounded that a single person from another world had been dragged into her plan, but she could make it work.

Ruby brushed off the voices warning and picked up a boy around her age and carried him to a nearby ruined building, "lifting Crescent Rose pays off with lifting stuff."

Lighting a fire she sat down and ran a hand over him looking for injuries, "you...you don't have your aura unlocked." Debating weather or not to unlock it, his world clearly didn't use aura. At least until she saw a slight red spot forming under him. That caused her to panic placing a hand on his chest and forehead she closed her eyes.

For it is in loving that we become ourselves. Through this, we become shapers of beauty and promise to strengthen the lonely in growing. Boundless in potential and unfraid of the end, I release your soul, and by my embrace support thee.

Ruby gasped as she felt his aura, it was colossal, that and she felt several binds on it snap as she unleashed it as well as a black aura not his own was forced to flee from his body. "Whoah...I need sleep." That had drained her more than she thought it would.

Harry woke up and looked around, a girl around his age was sleeping next to him, and judging from the blood nearby she healed him. Looking at his hands they were glowing slightly. Confused Harry called on his magic and his eyes widened when lightning began arching between his fingers. "What the...my magic is surging and my head is clearer then ever...what did she do to me." Harry sighed and pointed a finger at the pile of wood nearby, incendio he lit the fire and pulled out his bottomless bag and placed a pan. A few minutes later he had a nice stew going. Then walking around he began putting up wards so they weren't attacked by anyone, or anything around.

A half hour later the girl woke up and looked around, "something smells really good."

Harry laughed, "help yourself. It's the least I could do to help you since you healed me."

Ruby dug in happily, "thanks! This is soooooo gooooood." Ruby noticed the glow of his Aura all around his body like it was healing him. "Umm...did you get into a fight while I was out? Your aura is constantly flashing..."

"Aura?"

Ruby blinked, "oh! That's right. Your from another world, so you don't know about aura. In my world humanity are plagued by the creatures of Grimm..." she saw Harry stiffen up, "they're..."

"Souless monsters that seek to end the life of those with souls. Yea, I know."

Ruby nodded, "right. So sometime along humans fight to survive they unlocked the power of aura, or the outward manifestation of the soul. We use it to cloak ourselves in a passive field that protects us from hits that would normally be fatal. We can also use aura to unlock others aura and in some cases, use it in offensive ways, but my dad never told me how to do that... anyway, Aura covers our bodies so when we get hurt it rushes to heal the damage, you glow kinda like you are now."

Harry looked down at his arms, watching the numerous scars on his body slowly dissapear, "this will get rid of my scars?"

Ruby hummed "it should only get rid of the smaller ones that are capable of healing properly. I'm not sure why your aura is doing more than it's supposed to..."

that's quite simple actually Ruby.

Harry jumped up and raised his fingers, he wasn't sure where his wand was, and his fingers glowed red. "What the hell was that?!"

Ruby's eyes widened at the boys eyes and fingers glowing, "I'm not entirely sure, but she's been helping me get home..."

Harry looked at her funny, "what?"

"Yea! Me,my sister and my team were all yanked into this world somehow...were trying to get home, she said if I gather all four of these keystones I can go home."

She pulled out red stone and Harry narrowed his eyes, "that thing is trying to bond with you."

Anyway! To answer your question Ruby, Harry's aura is doing unusual things because he comes from a world where magic is abundant. He literally has magic running through his veins so his aura is utilizing his magic to heal the things it can't on it's own.

Harry raised an eyebrow and closed his eyes, sure enough he felt a small drain on his magic. "How long will this last?"

well, due to the massive health issues on your person it may take a long while, I wouldn't recommend using your magic until it's finished.

Harry blinked, "massive health issues? I've never felt better..."

that's because you are so used to it. You don't know what it feels like to be healthy. Currently your new aura and magic are steadily healing several incorrectly healed bones, the scars across 95% of your body and the severe malnutrition that you had, it was showing signs of regression showing a better living situation, but it would've been years before you were fully healed.

Ruby paled, "what happened to you?"

Harry sighed and ran a hand through his hair, "you can thank my 'loving' relatives. Anyway, you said we can get back to our worlds if we collect these stones yea?"

Ruby nodded, "yea! At least that's what she told me."

Harry nodded, "then let's go find the others."

Ruby blinked, "what?"

Harry gave his lopsided grin, "yea! On top of the fact that I can't use magic right now and the fact that I couldn't possibly let you wander around here alone I'm coming with you. You never know what kinda weirdos got dragged into this world with us, I'm surprised your sister let you wander around here alone." He held his hand out.

Ruby took his hand with a slight blush, "I can take care of myself. I have my baby to protect me."

Harry swiped his foot through the dirt disrupting several runes etched into the ground that was protecting them, but stumbled at that, "b..baby?! Your what...15? 16? You started a little early don't you think?"

Ruby was an red as her cloak while the voice laughed, "no,no,no! I meant this." She unfurled her scythe, "this is crescent Rose,I made her myself. That's why I call her my baby."

Now it was Harry's turn to blush, "oh...sorry." he followed her out.

Only to me immediately confronted by a pink haired man with blood red eyes. The dude had some serious problems and wanted to, at the very least, beat them up. "See Ruby, what did I tell you. Wierdo's." Ruby just nodded.

After they(Ruby) beat them both they wandered for a while, "we've been wandering for hours Ruby...let's take a break. The natural magics of this world is...strange, nothing should cause the weather and landscapes to alter so drastically." Ruby nodded and they found a couple of ruins.

"Hey! These ruins look just like the ones back home!" Harry began carving runes into the dirt and came across a metal object.

"Huh..." he pulled with all his might and he was astounded when the thing came out. "What the..."

Ruby giggled, "oh! Aura kinda Grant's you superhuman strength, some more than others. You mean you didn't wonder how I could lug around Crecent Rose all this time with so much ease and not look like a body builder?"

Harry blinked, "it...never crossed my mind." He turned to the break and finished his Wards and then sat down to observe the metal fragment from the ground. "You know what kind of metal this is Ruby?"

Ruby took out a rectangle like device and flashed a picture at it. "Nope. My scroll doesn't know."

Harry grumbled, "well...since were resting for the night I don't see a problem with it." Waving his hand over the metal it began glowing, "by the way, when you found me, did you find a wooden stick lying around?" He didn't really need it anymore, but it would be nice to have just in case.

Ruby blinked but nodded, "well...yea! But it was snapped in half from your fall, I was able to save the feather though." She bulled an orange feather from her pouch.

Harry winced but grabbed the feather, "shame...oh well, I only wanted it for...memories. Since you unlocked my aura I haven't really needed it."

Turning back to the metal he has found he was astounded by the results he felt, "this thing...it is saturated with magic. It's not supposed to look like this." He placed a hand on the metal and was about to channel some magic in it, before Ruby did the same. This caused him to grin, his friends back home would either be too lazy to see or would berate him for doing something stupid. The metal glowed slightly and both of them gasped. The thing seemed to pulse in his hands.

Harry, I wouldn't go beyond using much more than a few spells, you body is still healing remember.

"I only need one more." He waved his hand and Ruby watched as the blade reformed into a massive white blade with blue strips running down the middle and a blue crystal on the tip of the hilt.

Reaching out a hand he grabbed the hilt and was instantly shocked by the magic with, this blade had power coursing through it.

"Wow!" Harry looked over and saw Ruby with stars in her eyes, "that was so cool! What else can that do?!" She began running a hand over the blade and geeking out.

Harru smiled, "I'm not to sure Ruby...I guess we'll learn on the way huh?"

"A wise answer." Harry looked up and saw a blonde girl with pigtails in a gothic lolita's outfit. She looked to be around 12, but Harry got the sense that she was far older. "Take care of that blade magic user, it isn't every day something like that is given to a wielder outside of it's own time."

Ruby was startled, "who are you?!"

"Rachel Allucard, I'm thankful for this magical barrier, it has helped throw off the girls chasing me."

Harry's eyes narrowed, "allucard...as in the vampire? That explains the young face but old attitiude."

Red eyes met green, "you are wise beyond your years to know that."

Harry nodded, "a gift from my late godfather, father, and mother."

"A complete knowledge transfer, feel honored. That spell requires absolute trust."

For a few more days Ruby and Harry wandered and managed to collect 3 out of the four stones, each addition seemed to cause Harry to tense at the feeling. During that time Harry's aura and magic had restored his body to what it should be, he was now almost 6ft tall and had plenty of muscles. The first thing he had done when he had access to his magic again fully was transfigure his clothing to a better looking set that actually fit him. He even used up the extra magic to make it permanent by using cloth that the found around the world they were in, and resolved to burn all the rest of Dudley's old cast offs, and he also became a very good swordsman throughout the many battles they had.

"Ruby! I finally found you!" The duo turned and saw a girl who...seemed like she was obsessed with the color white, what wasn't white on her body was blue.

"Oh! Weiss! Where have you been?!" Ruby vanished in a flurry of rose petals.

"Gathering information. Who is this?" Weiss looked him up and down and couldn't help the pink tint that arose on her cheeks, he had shoulder length raven hair with emerald orbs that...oddly enough seemed to sparkle with silver tints, and almost seemed to glow. He was barely taller than her and was quite well built. He was dressed in a very nice combat outfit made of silk she wasn't aware of. His outfit consisted of a pure black shirt that had an emerald symbol on it that depicted a lightning bolt striking a crecent moon, he must've gotten the idea from being around Ruby, as every person in remnant had a symbol, be it hereditary like hers, or unique like Yangs. The sleeves were a bit torn near the hem but she saw it was an intentional thing as he had bandages wrapped around both arms, kinda like Blake does it only closer together so you couldn't see the skin. He wore Jeans but had armor around the knees and had several belts looped so one side hung off. He wore combat boots and had, like Ruby, a cloak. But his was way different, it was silvery and seemed to make parts of his body fade from view depending on what was under it.

"Oh! This is Harry Potter, unlike everyone else here who came in with a few people from our world he came alone. I met him not long after you left, he came crashing from the sky and I helped awaken his aura so he could heal, he's helped me get 3 keystones, though he says that they feel...malevalent or something. " seeing Weiss's curious look she explained, "in his world magic exists, it's been amazing seeing what he can do with it, I mean all these days you've been gone I have been sleeping comfortably, because with a wave of his hand he can make a rock feel like the fluffiest pillows."

Weiss's eyes widened at that, but she was still sceptical, "and he just does this to help? Why hasn't he attacked you and stolen the stones?"

Harry shrugged, "my world is in the middle of a war, but the goverment is denying that fact and placing the blame of the terrorists on my shoulders, although...they may think I'm dead, I fell through the veil of death before coming here."

Both girls were stunned, but it made sense because if he died in his original world then he wasnt expecting to go back.

After another fight were Harry watched the teamwork between the White themed girl and Ruby the keystones began to glow, and it grew into a massive robotic monster, the attack it launched was towards the downed Es, Harry acted on complete instinct and surrounded himself with lighting, getting their in front of Ruby and blocked the attack with his blade, unfortunately though the blade super heated and ended up reduced back down to a glowing rock of metal again.

Harry sighed and looked down sadly, he actually liked that weapon. He turned his attention to the monster and did what he could to help after that, sending Lightning bolts to strike the monster and such, but even with that team RWBY was struggling.

Threat assessment exceeds paramaters." A silver haired girl with six red wings landed next to Harry, and a blond with guns protruding out of her body arrived on his other side.

Es stood up, "you seem to have the power to help those four more than us." She looked to Harry. "Generating construction." She stabbed her blade down into the remnants of his blade, which began to form a near copy of her own massive blade.

The blonde turned, "agreed, you have fought alongside the red one. So you will be more helpful than us. Transferring expiramental transformation." She touched the blade and it shifted slightly allowing a gun to be built in.

The silver haired girl stared at the boy, "you can reach into the hollow and harness it's power more than any I have ever seen. I have accomplished my final goal, transferring wings." The crimson wings rushed out of her and flew into Harry, then connected to the blade, causing several different pieces to form, Harry didn't know how but he knew the wings had formed one giant blade that could split into four separate blades. The blade completely formed and it was a copy of Es's blade that was crimson red and had gears near the hilt signifying that it could change forms a lot like Ruby's weapon. Harry grasped the blade and grinned when he felt it pulse in his hand. He dashed forward and began fighting alongside team RWBY.

Harry grunted as he launched his new friend Ruby towards the monster that had come from the keystones. The voice was apparently trying to take over Ruby's world, a combination of lightning and rose petals were flying from Ruby, Harry had discovered his semblance along his way, the ability to manipulate and absorb lightning, he had used lightning to launch Ruby at a speed so when she used her semblance her scythe sliced clean through the monster.

As the world began to fade Harry smiled sadly to his four new friends, "goodbye team RWBY..."

"Harry..." Ruby looked sad but hugged him, then the world collapsed and Harry found himself in a dorm room with two sets of beds stacked very dangerously ontop of eachother.

"What...where am i?"

Ruby looked happy, "welcome to Remnant Harry!"

Harry looked around wide eyed, "I'm supposed to be dead..."

Yang slapped him on the back, "don't look a gift horse in the mouth. Come on, let's go introduce you to Ozpin."

Ozpin stared wide eyed at the first year team. They had disappeared on the field trip to forever falls forest, only to reappear in their dorms with a stranger. "So, let me get this straight, you four were sucked into another world to fight in a tournament, won and returned. The girls all nodded and the crystal hovering around Ruby glowed in confirmation. "And you, are from another world, a world full of magic that you died in, but before your soul departed the world you were pulled into the same tournament and ended up coming back with team RWBY."

"Yes sir...your taking this awfully well..."

Ozpin sipped his mug off hot chocolate, "I've seen a lot of stuff in my day, this doesn't surprise me in the least." He had lived with two literal Gods, so this wasn't that far fetched to him. "So, Harry how about you become a huntsman. From the story you have taken to that blade well."

Harry smiled, "a life of adventure and danger, the chance to help people, how can I resist?"

Ozpin grinned, "excellent. Then you will be joining team RWBY. I'll have a scroll and a uniform delivered to your dorm. Thank you for coming to tell me everything."

"Just an second sir, is it a good idea for a Male to live with four girls?" Weiss asked.

"I believe Mr. Potter will have a solution for than Ms. Schnee, but even if he didn't, a lot of other teams have men living with females, your friend team JNPR and team CFVY as well and we haven't had a problem."

Harry stepped into the room and looked around, "this is...extremely dangerous. Especially the bed hanging from the roof."

"Not a lot of room." Blake said.

Harry sighed and waved his hand, the room expanded and walls began to separate, five rooms were now joined by a big common room, three different bookshelfs flew out of Harry's bag and two filled with Blake's and Harry's recreational books, the third was a combination of video games, text books and movies.

A T.V was set up on the wall and a gaming system was set up. "There. Now we each have a room to ourselves, but we still have to share a dorm, so if your using it lock the door. I don't want to die from walking in on you."

Everyone of the girls eyes widened in wonder, Blake began running her hand over the books he had with him, "some of these books are massive..."

Harry grinned, "yea. Real popular in my world. Help yourself."

As Harry finished a few potions he smiled at the sound of his new team in the common room, "a new life with new friends, don't even have to worry about Voldemort hovering over my shoulder."

He laid down and promptly fell asleep.

let me know how this turned out...

Rec stories for thos chapter.

Rwby option is Black reaper by Vengfulfate this is one of my favorite RWBY stories, it's a Ruby/Neo with a mention of past ruby/Velvet and a monochrome backround, it basically is a story where the fall of beacon happens way differently and Rwby ends up losing her mind and joining forces with Roman and Neo and everyone is trying to bring her back to the main story. An amazing story and I'd really recommend you read this.

Harry Potter rec is Across the time by izwan, this is a Harry/Fleur story, it starts way after the war where Harry married Fleur and Fleur is dying. Harry ends up back in his fourth year and decides to help stop the war before everyone dies again. This is one of the few stories that I read/wrote that did not bash Ron or Ginny. They had a reasonable reason for Harry not to be with Ginny and I loved the twist that was a few chapters ago, though it's updates are extremely spaced and random...but it's a really good read even if it doesnt focus on battle.

Crossover rec is A Grimm Huntsman by TheSilverBoar, Harry is sent to Remnant after he is thrown through the veil of death due to what happened to him when Voldemort killed his parents. It's still in progress but it is regularly updated, it's a harry/winter story, but it story pretty close and no romance has started yet. This is not currently a story for fans of Weiss and Blake, both are extremely prejudice and it bashes them and brings out the worst of both pretty fast. Though in return he boosts Jaune up more in his story, I'd really recommend that if your into that.