Luca can be spooky if he likes, but chooses not to.
He is a ghost, but usually just appears as a slightly see through ghostly person, who fell into a bin full of late 80's grunge clothing and terrible fashion choices.
when he gets angry (or when he really feels like it) he can look kinda spooky c:
but most times not
Link
taala
ooooh I like it a lot xD