"But for you, your next mission is to get rid of Todorki Shouto once and for all. Before the next major operation, understand?"
When Dabi heard that, his heart dropped into his stomach. Todoroki was his beloved youngest brother and he would never kill his brother no matter the situation. Under normal circumstances, he would reject any mission that he did not want to do as the other villains would still be able to take over him. However, this time was different. If he rejected the mission, first off, Shigaraki Tomura would be furious and no one wants to experience that. Secondly, if another villain were to take on his role, his brother's safety would not be guaranteed. Thinking of what could possibly happen should he reject this mission, he shivered inside merely at the thought of it. "Sure, I won't fail this time." Dabi shrugged and walked back into his own room.
Once he ensured that his door was locked, he collapsed onto his bed and let his mind wander as he closed his eyes...
"Toya-nii! Play with us!" When Dabi turned around, two young boys were running towards him with smiles as bright as the morning sun. The older of the two had white hair while the younger had both red and white hair. Dabi mouth turned into a small smile seeing his two younger brothers running towards him. How he wished that this moment would last forever. At that blissful thought, a loud voice boomed in the background. "SHOUTO! TIME FOR TRAINING!" Just at that moment, the owner of the voice, appeared in his view. "Shouto! How many times must I tell you not to play with those things! You should spend your time on training! Come!" In that instant, the happiness in the air completely disappeared and Dabi's wish was instantly destroyed. When he turned his attention away from his father to his two brothers, Natsuo was trying his best not to cry while their youngest brother, Shouto had already began to cry. Hearing Shouto cry, Dabi's mother appeared along side with his sister, Fuyumi.
"Why do you need to ruin their childhood! Why can't you let them live like normal children! When are you going to ever treat them like your own children!" Dabi's mother shouted in the direction of the dojo, where his father was waiting inside. Dabi's mother and sister pulled the three young boys into a hug and softly comforted Shouto and Natsuo. "Toya, Natsuo, Shouto, it's okay. Everything's going to be fine. There there, stop crying." "I won't repeat myself! Shouto! Come here NOW!" And just like that, the peaceful lives of the Todoroki's ceased to exist.
This incident occurred around 10 years ago, when Shouto revealed that he inherited both his mother's and father's quirk. When his father found out, he instantly separated the young 5 year old from his siblings and refused to let him play with them. However, as far as Toya could remember, Shouto would still sneak out occasionally to play with him and Natsuo. Despite the fact that their father only saw Shouto as his only son, Natsuo and Toya never hated him or blamed him for anything. The bond that the three of them shared was not going to be destroyed by their father.
This was the daily life inside the Todoroki household. Shouto was constantly training with his father, rarely spending time with his siblings, Fuyumi was always with their mother helping out with the household chores while Natsuo and Toya went to school. But one incident changed their lives forever.
When Toya and Natsuo came back from school one day, they realised that the house was oddly quiet. They did not hear their father shouting at anyone, there was no sound coming from the kitchen, it was eerily quiet. Both brothers dropped their bags by the front of the house and began to search for traces of life in the house. After searching for around 5 minutes, the front door opened and their father walked in.
"Where's everyone?" Toya asked his father. "Hospital." The pro hero Endeavor said only one word and continued to walk to the house, not looking at either boys. At this point, Toya connected the dots in his head. 'Everyone's at the hospital, but he is unhurt. Don't tell me...' Seeing red, Toya lept forward while activating his quirk.
"How could you!" Toya screamed and he tried to land a punch on his father. However, due to many years of being a pro hero, Endeavor was able to evade the sudden attack completely.
"How could you! How could you! You monster! You don't deserve to be called a pro hero!" Toya continued lunching attack after attack at his father. While the whole fight between Toya and Endeavor happened, Natsuo was rooted to the ground, too scared to do anything.
Although the onslaught of attacks were relentless, it was a pretty one-sided fight. A few minutes into the fight and Toya could feel his hand hurting from overusing his quirk. Toya, being the first child of the Todoroki household, inherited his father's flames. When Toya first activated his quirk for the first time, blue flames surrounded his hands. Seeing this, Endeavor was quite pleased as everyone knew blue flames were much stronger than normal flames. However, blue flames required much more stamina and control. After training Toya for a few days, Endeavor realised how little stamina Toya had and instantly disregarded him as his son for not being able to fully utilise his quirk.
Feeling that the attacks were becoming much weaker, Endevaor raised his hand and managed to catch Toya's fist. "Is that all you got? I'm disappointed with you. To think that you are the next heir of the Todoroki family. Such dishonor." With all that said, Toya finally lost all his control and fully activated his quirk. Similar to his father, blue flames appeared and surrounded his body and aimed one final punch at Endeavor.
However, despite all his efforts, Endeavor was much to quick and powerful for him. Before he could even reach Endeavor, he was hit square in the face and flew backwards. Seeing his brother 'losing' to his father, Natsuo was instantly shook out of his paralyzed state and ran towards his brother without any hesitation to see if he was hurt.
"To think that this is all you got as the oldest son is ridiculous. Even Shouto is stronger than you at this point. From now on, you are no longer a Todoroki. I don't need someone was weak as you to be part of our family. Natsuo! If you help your useless brother in anyway, you are also no longer a Todoroki. I've had enough of you weaklings." Hearing everything, Toya gently pushed Natsuo away and exited the main door, not turning back even once.
This was the last time that any of the Todorokis ever saw Toya. When Natsuo told the whole story to Fuyumi and Shouto, they frantically searched for him with the police to no avail. Up to this day, Todoroki Toya is still missing.