Haikyuu! Headcannons

Obsessions

Oikawa gets really paranoid when he finds a shiny or metal object. It was the aliens man 👽 Oikawa strongly believes in aliens and gets constantly teased by everyone in Sejioh VBC.
Once when they were young, he made Iwaizumi come with him into the forest to look for UFO's. Let's just say Oikawa got a few bruises.