Responses
they have to die while they still have regrets. mitsuba wished to have friends--but he died before he could fulfill that wish, etc etc
doubt, mitsuba died with regrets but just was a spirit, he became a supernatural after he ate the heart
oh, true, i forgot ab that
the way to be a super natural is to die with a twist, dunno what the twist is. hanako commited die, painting girl died of an illness, mitsuba car accident, etc..??