Project Xeno, Japanese branch, year 2005
The chief scientist of the Project Xeno wanders the halls of site 2 making sure that everything is in check when he enters cell 0176 where a frail,skinny,green haired,freckled,green eyed boy,age 8 who is chained up with electric restraints "hello izuku" the man says, the boy named izuku immediately gets aggressive and tries to attack the man but he's stopped by his restraints "subject appears to be acting violently" the man says writing on his note pad, izuku hears a scream from the other cell and he tries to get out of his restraints but he gets electrocuted and he reals back in pain "now now izuku none of that" the man says leaving the room to call in a test subject. As soon as the cell is locked down completely izuku is let free and immediately begins to tear at the wall trying to dig out, izuku hears a man being lead to his cell so he jumps to the wall and sticks to it and after a few seconds the lights are turned off but izuku's eyes quickly adapt to the dark
Izuku watches as a strange creature is thrown into his cell, the creature appears to be a rat,bear and a dog hybrid and he appears to be very scared, izuku breaks the lights so he blends into the darkness leaving the hybrid to cower in fright "what is your name" izuku asks still under the cover of darkness, the hybrid says his patient code "not what I asked. Name" izuku says, the hybrid tells izuku that he dosen't have a name instead it's just a code so izuku drops from the ceiling and comes close enormous for izuku to see the terrifying new appearance of the boy
"W-what are you" the hybrid asks terrified out of his mind, izuku says that even he dosen't know and eventually he lies down on his stomach "how long have you been here" the hybrid asks, izuku remembers when he was first brought to the facility "around. 7 or so years" izuku says not quite sure about his answer, izuku rests his tail on his own head leaving the bladed tip pointed at the hybrid still not comfortable with him in his cell. Izuku and the hybrid have a conversation about the facility and it's infrastructure before izuku gets up reeling in pain and screeching, the hybrid tries to help izuku but the reserve lights are turned on blinding the two and several robots drag both out putting the hybrid back in his cell and izuku is brought through several doors putting him in restraints
Several hours later
Izuku wakes up and sees that he is over seven times his origin human height and triple the size of his transformed state, izuku is strung up and looks to his left and sees a familiar looking creature to his transformed state just a bit bigger and it's head shape is a bit more jagged. The creature is also in restraints but it looks towards izuku and makes a similar cry as izuku did but izuku hears something "father" the creature spoke to izuku, izuku is shocked that he understands the creature "are you ok" izuku asks, the creature is shocked that izuku cares about it "I'm ok father. It's you I'm worried about. These humans. These. Monsters. They want to hurt you. They want more of you" the creature says, izuku explains to his offspring that he will not allow the bastards to use him or his offsprings, izuku turns back into a human and bites his wrist drawing green blood that when it comes into contact with the shackles it begins to slowly melt through the restraints so he continues to bite down on his wrist until he has fully melted then he rips off the other cuff
Izuku then rips off the restraints around his feet and torso before going to his offspring to free them. Izuku falls down due to blood loss but his offspring picks him up and jumps into the vents setting off the alarm "father I'm sor-" the creature tries to speak, izuku stops his child saying it was ok and that his child didn't know "I'll be ok my child. Let us stop these bastards" izuku says, the two wait for izuku to heal and when he does the two spring an attack in the locker room of the soldiers of the facility and izuku hears more and more cries for help from the same creatures as himself and his child "my children. I'M COMING I'LL SAVE YOU" izuku yells, izuku leads his child to go help it's siblings so izuku grabs a gun
While izuku and his child are going around the facility they free all the prisoners who were kidnapped, izuku lets his rage and hate take over beginning to morph into his giant form
Izuku breaks down the door and looks in horror at what he sees, he sees a giant room spilt in half one side dedicated to torturing izuku's offsprings and the other half is filled with strange eggs that hatch and attach themselves to human test subjects. Izuku breaks all the machinery keeping his children locked down and he tells them all to run away and relocate where it is safe, izuku feels his hard outer shell getting hit and he turns to see soldiers shooting him and he crushes them like ants
Izuku yells as loud as possible sending an order for a small group of his children to overload a nuclear reactor. But the command also demanded that izuku was to be left behind which none of his children wanted to do but they still did as they were commanded, izuku goes by the last cell. The one of the hybrid who was not able to escape so izuku destroys the glass "hybrid. Go now. This place will be blown to smithereens" izuku says, the hybrid walks out of his cell and refuses to leave izuki there. Izuku tells his first-born to grab the hybrid "hybrid. I now have a name for you" izuku says as the first-born picks up the hybrid, "it's nezu" izuku says, nezu's eyes go wide as izuku snaps his fingers to signal his first-born to leave with nezu
Izuku finally hears the alarm go off for an overload so he sits on the shattered glass of nezu's cell as the entire facility flashed red "I shall die here" izuku says but not with a frown but with a smile though he was not happy, izuku is suddenly picked up by his children who run out if the building with him in their tails. Izuku hears the words of his children "father will not die here" "father is safe now" "father will be ok"
Izuku is now far enough away to see the building blow up deep in the forest just down a mountain. Izuku sends all the prisoners back into humanity but nezu dosen't want to go "nezu. You need to go. Your power will be useful for teaching a new generation of good people. Just because humans here were bad dosen't mean all humans are. Go my friend" izuku says, nezu takes izuku's words and leaves. "Now. I need to relocate. I need to prepare to take you on"
"All for one"