Your deku

Katsuki is obsessed with Deku, and he got jealous when Ochaco came closer to Deku, so he killed her for Deku . He saw Deku come inside the room and scared, and Katsuki gave a psycho laugh

Katsuki:Izu~where are you hiding~ come out come out wherever you are IZU~ Don't hide from your KACCHAN IZU~

Katsuki spoke in a yandere,obsessed,psycho,possessive and insane tone