Amos here is very willing to be a Kenoma buddy... He wants to do good and clearly, doing good means helping the new guys get settled in and adjusted so they can go kick some Pleroma ass. (He is already super loyal to the Regent, sorry pal.) But he's also extremely non-judgmental so he probably wouldn't do more than bat an eye at said undead traits. If that's just who Liem is then it's who he is, you know? It's no big thing.