I don't know... Lobo is DC, and Wolverine is Marvel... I can't really see it happening. Granted, they all are awesome. Personally, I like the android Human-Torch and the Sub-Mariner (Aquaman is a poseur), but I don't know how useful they'd be on Z-Day. Someone else I should have added to the lineup would be Samurai Jack. I've seen him fight zombies before, and he does not disappoint (does he ever?).
C'mon.... we all know there's only one who jumped over into the comics that would put everyone else to shame, and that's Ash!....... and maybe after him Boba Fett...