The midoriya demon siblings

Izuku and Ume Midoriya were always inseparable, when they were four years old they learned that they had the same quirk, giving them super strenght, speed, reflexes and many more abilities.
However they were treated like monster by everybody due to there appearance and incredible strenght.

"How pathetic! shishishi! Why don't why join us!? That's a great Idea! If you join the LOV we'll be buddies!"

"Oni-chan! I don't want him here! please kill him!"

"Oh well too bad, but my little sister wants you dead, goodnight!"