Morbius is a villain from the Spider-Man comics, who essentially gave himself vampirism, but only the kind found in bats. I'm sure I've seen him, however, in the Spider-Man cartoon reacting unfavourably to sunlight, crosses, and holy water.
Which is he? Undead, or human-bat hybrid? And if he is one with traits of the other, is there any in-universe explanation for this?