Cant stop thinking about reader being Shotos quirkless twin sister, born minutes after her brother.
Already being considered lesser than her brother by their father because she’s a girl, only to have her fathers disappoint and anger grow tenfold once it’s discovered that’s she doesn’t have a quirk, a stain marring the Todoroki family’s prestine and powerful image.
At least he gets a son with the perfect quirk as compensation, a successor to take his place and one day surpass Allmight, even if he now has to try and hide away his youngest child from the public eye, worried people might think him and his genes weak for having created such a powerless offspring.
Thinking of Yandere!Enji wanting to keep you locked up and out of sight, to protect both his reputation as well as his fragile, defenceless youngest daughter from a world full of villains ready and waiting to take advantage of a weak little thing like you, his paranoia of losing you going over the deep end after Touyas death disappearance.
Even with his focus on Shoto’s training, building him up to be a worthy successor, he can’t let you roam around freely like your older siblings, Fuyumi and Natsuo; whilst not having any combat training, they at the very least have quirks to protect themselves with if they need to.
You on the other hand need to be protected by your father. He may not be the best dad around, but when its just the two of you he can pretend for a moment he’s the kind of guardian and source of safety that children should view their parent as, bringing out unfamiliar paternal instincts within the man.
Having you around strokes his ego, making him feel even more powerful compared to your delicate self, a big, strong protector watching over his little girl, the proud lion guarding an innocent little lamb.
Yandere!Shoto feeling just as protective over his twin, but expressing it differently. He doesn’t just want you safe, he wants to see you happy. (Although, if a choice had to be made between your safety and happiness, Shoto would find himself in a position more similar to his fathers then he would like to admit.) Despite Endeavours best efforts to keep him isolated from his siblings (and you from the world) no one could truly take you from him, his angel sister, who came into the world with him and would continue to stay by his side for the rest of his life if he has his way. You’re his other half, the both of you two sides of the same coin. He believes he was born with such a powerful quirk so that he would be strong enough to always look after you, working himself to the bone when training to become the next No. 1 Pro Hero so that he’ll be strong enough to protect you from anything that might try to take you from him.
Unlike Endeavour, Shoto doesn’t want to keep you locked in a cage like a sad little pet bird, he wants to see you joyful and free (so long as he’s there to watch over you.) He wants to pay you back for all the years that you would sneak into his room after painful and gruelling training sessions with his father, your fingers running through his duel coloured hair and tracing soothing patterns onto his back as you hold him in your arms and comfort him, telling him how loved he is and that he will never be alone. He holds onto you like a lifeline, because without you there is no him. In Shotos eyes, it’s the two of you against the world, and he would rather die then part from his twin.




















