Aslan and Xigbar will be unaffected by the plague. If you need your character saved from the brink of death or guided towards the real cure (forgiveness, resolution, etc), I'm game for that with Jesus Lion here. Xigbar will be available for company plottings and the like.

Deathstroke has massive guilt issues where his friends and family are concerned, so he'll be hit pretty hard.

Livio has severe guilt issues over the death of his surrogate brother figure and people he's killed in the past so another that will be slammed into.

Proxy One...I am undecided. If it affects him, it probably won't be by much.