Originally Posted by lombre
I've noticed that Momma Bosco's ghost went from being elderly in What's New, Beelzebub to looking surprisingly youthful in The Penal Zone. Is there some line of dialog I missed that explains this, or has Momma been clicking those annoying pop-up ads that claim to make you look 20 years younger?
I don't think that any explanation is needed. While in traditional European folklore (I assume same applies to American folklore too, but I'm not 100% certain) ghosts appear like they were when they died (often showing the wounds etc. which killed them) in modern popular culture ghosts can sometimes change their appearance at will. Most of those works don't bother to explain it either, but just assume that ghosts can control their ethereal form.