A means of evolution
I don't own prototype or MHA
Responses to reviews
No he is not going to be overpowered at the beginning and he is not like either mercer or Heller he is like the cannon personality wise as mentally the virus left Izuku's mind as untouched as possible to avoid detection also Heller's and Mercer's personalities would have long since been drown in the trillions of other voices within itself although it might pull some information to help out its current host from time to time and the virus will only show itself if the situation is to threatening for the host aka Izuku to deal with or it begins to hunger for fresh genetic material.
On with the story (the next day)
Izuku sat quietly in the back corner hoping that the teacher wouldn't – "Ahh Izuku I see that you also want to attend U.A." said the teacher encouragingly only to be cut off as Katsuki hit Izuku with an explosion enhanced punch launching the poor boy back against the wall violently while the students laughed at Izuku's dream and what happened to him.
"Stupid fucking Deku what are you thinking?!" yelled Katsuki before the teacher grabbed his arm tightly and forced him his seat.
"Katsuki I expect to see you in the principal's office after school!" and with her peace said she moved back to the front of her classroom to resume the days teachings while Izuku got up and moved to his seat unaware of his passenger's primal anger towards it's host's attacker but restrained itself for a good opportunity to seek revenge.
Later that day
Izuku was walking home when suddenly a blob slides out of the sewer near him making a sticky wet sound as it did so earning young Izuku's attention.
Izuku froze it was some type of slime quirk user the momentary pause was all that the slime needed to attack and latch on to Izuku before it began to smother and suffocate him.
But before to could strangle him to much the sound of something heavy landed near them causing the slime to turn and say something which Izuku couldn't hear and then suddenly Izuku felt something grab his arm and then the slime was ripped off of him and thrown into the nearby building while Izuku was left roughly in place.
Shocked Izuku turned to look at his savior while the Backlight seethed at the loss of a potential ability as it hadn't absorbed an ability like that before but as Izuku turned around he and the virus were shocked it was All Might, the symbol of piece!
All Might turned to Izuku and in a deep manly tone asked "Are you ok young man?" this earned a shocked nod from Izuku.
Turning away Izuku All Might scraped the slime which had splattered due to its meeting with the wall into a small container before he set it down before turning back to Izuku "Well good day young man." and with that All Might prepared to jump, realizing this Izuku ran forward accidently knocking over the canister as he lunged and latched on to All Might just as the mountain of muscle launched into the air.
Both people went flying main difference was one was screaming loudly and was clinging to the other like his life depended on it which while he didn't know it he wasn't that fragile.
All Might looked down at our poor frightened boy and asked "What are you doing boy? Let go!"
Izuku just shook his head and yelled in reply "Are you crazy if I let go I will die!" All might gain a look of recognition.
"Oh I suppose you are correct young man allow me a second and I will land." said All Might angling for a landing on the nearest building.
Once the two had landed Izuku shakily let go of and attempted to hug the roof of the building in an attempt to calm his heart before he stood up with a look of determination "All Might d-do you think it's possible to be a hero even if even if they don't have a quirk?"
All Might looked at Izuku with a look of understanding and a small bit of pity and he knew his next few words might shatter the poor boy "No…it's just too dangerous for someone like that to be a hero."
Izuku froze his hero, his idol was basically was telling him to give up on his dream virus inside him was livid it wanted nothing more than to rip All Might to pieces and absorb him as over the years it had come to encourage Izuku for two reasons one it was a chance to collect powerful DNA samples and two over the years it had come to respect Izuku's wish and his commitment to it and in turn wished to help him out when he went in for the test.
All Might placed his hand gently on Izuku's shoulder once he saw Izuku lower his head before he muttered a small sorry before he once again leaping away leaving Izuku to exit the building by himself with his thoughts unaware of the danger that his fellow class mates were in due to his mistake while grabbing his idol's leg.
(The slime escaped and attacked the short shot prick AKA Katsuki)
Once he reached the bottom floor he was greeted with the sound of sirens so naturally he took off in the direction of the noise.
After a minute Izuku came across the source of the noise, police who had surrounded a blob which Izuku recognized as the one which attacked him and as he got closer he recognized the new addition to the blob which was a person he knew fairly well as Katsuki and the blob was making him launch fire blasts in random directions to keep the few heroes that were there away.
Izuku stood still for a second watching as the heroes did nothing but stand around waiting so in a burst of determination and defiance against his idol he ran forward and jumped landing on the only spot on the creature that seemed solid its eye.
With a scream of shock and pain the creature lurched backwards giving Izuku enough time to grab Katsuki's arm before he began pulling desperately at his classmate's arm his efforts were rewarded with a smack from the slime but Izuku held on stubbornly before an idea struck him and he grabbed Katsuki's wrist and pointed it above his head.
"Katsuki shoot now!" screamed Izuku while fighting to hold the arm in place as the slime tried to make the arm point away from it again.
Katsuki snarled as best he could with the slime down his throat but did as was asked of him blasting the creature with his flames once again earning a scream of pain and agony before it let go of Katsuki allowing Izuku to drag the other boy away from the slime.
All Might watched slightly shocked at the display from the boy and he decided to go down and meet with him to speak with him about continuing the line of All Might.
And cut