Or how about Zenos comes back, but as it turns out, he didn't succeed in burning away his life properly and dying, instead he only burned away his powers thanks to overexertion. Now he can be done in by any group of nobodies who've never trained or fought in their lives, or any random beastie in the woods. He still wants the WoL to kill him, but the WoL won't have any of that since he can be knocked unconscious by a slight love tap, so he'll never find fulfilment.

Hah hah, comeuppance and all that. He can be a running gag.