Switch 4: Nakajima Atsushi and Nedzu

(BSD Era)

"No. Not you again," Kunikida whispered softly but with feeling.

"Ah, Kunikida-sensei. Long time no see. Was I a large mouse, a small bear, or a dog in my old body. I don't even know myself. But what I do know is that this ordinary high school principal is currently a tiger-man detective~!" Nedzu chirped, enjoying the blond man's misery a tad too much.

Kunikida actually started weeping. The last time Nedzu made his presence known, the body-swapped chimera nearly succeeded in taking over the city and ruled over it with an iron fist. Despite the chaos, during the days the high school principal was trapped in Ranpo's body, Yokohama had never been so peaceful before. Understandable, given how most, if not all, criminals were forced to stay on their toes while Nedzu was active.

"What did you do to them while you were hijacking my body?" Ranpo asked. Oh yeah, he was the only one who hasn't been exposed to the Nedzu's reign of terror.

Nedzu gave them all a knowing grin. A cruel and twisted smile that looked creepy and off-putting on Atsushi's face. "Oh…this and that."

Earlier today, Akutagawa stumbled upon Atsushi and attacked him as usual. Unluckily for him, Starters chose the perfect time to take its effects on the eighteen-year-old. By the time Armed Detective Agency had arrived to save him, Nedzu had just finished up leaving his thoroughly beaten would-be attacker hanging at a public intersection and tied up Japanese bondage style using strands of Rashomon. (The incident then changed from helping Atsushi to helping Akutagawa.)

News about Port Mafia and the ADA struggling to get the furious Akutagawa down from where he was strung up had made headlines. The organization's activities grinded to a dead halt shortly after that. Not a day after the incident, Mori Ougai later sent a formal letter (not even written in crayon, which was telling on how serious he was taking the situation) to Fukuzawa Yukichi practically begging the ADA president to keep the body-swapped "soulless demon from hell" away from Port Mafia.

"So has the ADA received any new unsolved cases recently?" Nedzu asked.

Kunikida was about to reply that Nedzu was barred from taking on any cases until Starters had worn off, however, Dazai quickly slapped his hand over Kunikida's mouth before he could get a word in.

"Don't. Just let him do what he wants. We do not want another White Reaper Nedzu Incident," Dazai hissed frantically.

Underneath Dazai's Kunikida said, "Buff whf ef 'ee ge' da 'Peshal Abulty De'arment to-" But what if we get the Special Ability Department to-

"Fuck them! Have you forgotten that this is Nedzu we're dealing with?! They're probably in the middle of a lockdown now that word's gotten around that he's back!"

(BNHA Era)

"Well, hello~ Who is that snack standing over there with Aizawa-sensei?" Ashido purred.

As the pink-haired Heroine-in-training walked to her class, she spotted Aizawa walking around UA with an unfamiliar person timidly trailing after him. The newbie was a tall, youthful-looking man with pale skin and equally pale silky-smooth hair. The vicious scar over his right eye adding a degree of masculine ruggedness to his otherwise delicate good looks. From the looks of it, UA has a bishounen eye candy gracing its walls, much to the delight of all the female students.

"OMG, check out that white-haired cutie with Eraserhead!"

"My kingdom for his number."

"Seriously? He's hot and all, but he has to be around what? Twenty-five? Thirty? Since when are you into older guys?"

"Think he's Eraserhead's apprentice or something?"

"Nah, maybe more like an assistant or something. Poor guy. He kinda looks out of his depth there."

"I suddenly have an urge to wrap him up in a blanket burrito and stuff him full of chazuke."

Later on in the day, it was eventually revealed that Enders had taken effect on one of the UA staff. The reason why Aizawa was (unfortunately) given the duty of watching over the latest Enders victim was to keep the body-swapped man in line. According to the rumors, the staff was concerned about the potential chaos he might cause if left to his own devices (like last time, they said).

Towards the end of homeroom, Aizawa finally got around to introduce his charge to Class 1-A.

"M-M-My name is Nakajima Atsushi, and m-my Ability is Moonlight Beast. It's nice to meet you all," the white-haired man said to Class 1-A nervously.

"To save me the headache and satisfy your curiosity, I'm letting all of you interrogate him until the start of your next class."

"Um, what does your Quirk do?" Midoriya asked with his notebook and pen already out and ready.

"Quirk? Oh, right. Future, almost forgot," Nakajima said, "Moonlight Beast allows me to transform into a tiger. But due to the unique nature of this person's body, we've ran into some complications with my, um, Ability."

"How old are you?" Hagakure chimed in.

"Eighteen," Nakajima answered and he added, "At least, back in my old body."

Ashido lit up like a supernova. A three-year age difference isn't so bad.

"Earlier you've expressed that your Quirk is malfunctioning. Is that the reason why you're under Aizawa-sensei's care?" Iida inquired.

"That's only a small part of it. It's not that there's something wrong with my Ability, but rather, it's more your teachers wanted to make sure there's nothing wrong with me as a person." Nakajima explained, briefly recalling their comically horrified reactions towards him after Starters shoved him into Nedzu's body.

"The main reason why Aizawa-san is keeping watch over me is to make sure your headmaster's unusual biology doesn't make my Quirk any more uncontrollable as it already is. Because Nedzu-san is some sort of animal, and I'm not (in my original body, I mean), we think that Moonlight Beast's transformation process is reversed in this body. From animal to human form instead of the other way around. Um, speaking of, is Headmaster Nedzu a mutated mouse or some kind of small bear? I've asked your teachers, but no one could give me a straight answer," the white-haired man meekly trailed off, noticing that every student in Class 1-A had gone deathly silent and wide-eyed while he was speaking.

…

…

…

…

"WHAT?!!"

'So that's what Nedzu looks like if he had a human form,' all of Class 1-A mutually thought once their brains had fully processed the information.

"Oh no, he's hot," Kaminari whispered-screamed, referencing the very befitting meme.

"Alright, time's up. If you have any more questions to ask, you can go see him during Nedzu's office hours." Then, Aizawa turned to the young man and ordered, "Nakajima, undo your Quirk. Nedzu's body doesn't have the stamina to keep up the transformation facet of your Quirk for very long."

"Eh? But I can still keep going for about another hour."

"Don't lie to me. I can see your legs trembling. You've been holding onto that human form since this morning. I'm surprised you could still stand," Aizawa scolded the body-swapped tiger-man as he activated Erasure on him.

Immediately, Nakajima's form was covered in a brief flash of blue light and quickly shrunk down before dissipating. There, standing where the white-haired bishounen should be was the familiar form of UA's Quirked animal headmaster.

"Alright, let's hurry up and begin the next class. We've wasted enough time as it is," Aizawa announced as he scooped up anxious-looking Nakajima and deposited the body-swapped young man onto his desk.

Just like that, Ashido's lady boner for Nakajima died quicker than Mineta getting shot down by a girl. At this point, she was pretty sure she'll never look at another hot guy again without superimposing Nedzu laughing maniacally while drinking tea in the place of her love interest. That's a mental picture guaranteed to kill off any and all desire to date.

She wasn't the only one mourning the loss of her libido as later on in the day, the wails of dozens of girls (and a good number of boys) echoed throughout the halls of UA.

AN: Nedzu's nickname in the BSD era, "White Reaper," was taken from the light novel, "BEAST - White Akutagawa, Black Atsushi," featuring an AU where Atsushi worked for Port Mafia in place of Akutagawa.

So yeah, Nedzu has made quite an impact in the BSD era the last time he was there. Everyone on both ends of the timeline thanked their lucky stars that Ranpo isn't interested in causing as much panic and chaos as he could when bored out of his mind. As for Atsushi, Aizawa dubbed him "Problem Child #2" after an incident where he injured his leg so bad while fighting a random Villain that he self-amputated his own leg in order to kickstart the regeneration process. Even though it grew back, it still didn't stop Aizawa and Recovery Girl from giving him a lecture of a lifetime on self-preservation and proper first aid.

This is a self-indulgent crossover fic. I had a brain fart, and this is what I came up with. So just read, enjoy, and don't take it too seriously. Thank you for your time~ d(´･ω･`)