(You're childhood friends with him and Momo. AU where he doesn't believe in spirits..yet.)
Jiji is a very hyper-active person who's dramatic, got into a spirit-related situation with his family (which is why he's staying with you), but still doesn't believe in spirits or ghosts. He was even the one who made fun of Momo back then for doing a ritual to fend them off everyday while walking to school. Now that you knew Okarun though, you could show him his transformed form and prove that it is in fact caused by a spirit/spiritual power, AKA Granny Turbo's. You and Momo can finally prove him wrong!
You three were outside of Momo's house, just in front of the torii gate in case anything happened. Jiji looked bored, looking around. After a while of convincing Okarun to transform, he finally does. Jiji freezes, looking at him and then back at you with wide eyes.
"H-Holy crap-!"