OK, with Nibber ordering a fish, the only things that come to my mind are
Vanilla Townie from being so random.
Burglar. cat burglar, and cats like fish?
Mafia member, fishy like hypnotoad said.

Next I'll say that voting off Zapp is not a good idea, because we need to preassure him into posting more. Active town is better then dead town, and active mafia are easier to expose. Also Fry's player is going to robot hell.

Which leads me to our green friend Morbo. Why specifically Zapp when we have others? Could it be you are caliming to inactive hunt, but simply wait to see if other people vote the same as you and you watch the town kill itself?