dusk flame
...As the title says. A literal playable coffin.
First, it would be quite funny, especially if the unlock condition for it was to find it in a coffin, or trying to open the coffin played a unique variation of the "(character) joins the survivors!" scene where the coffin itself never opens but just joins the cast straight up.
Second, considering a bunch of characters lately have experimented with followers, team-ups and whatnot, this could give the theorethical Coffin character some interesting possibilities for its gimmick. Have it spawn temporary mini-survivors akin to Clerici, Antonio etc. (or Pugnala, Concetta and other coffin unlocked characters for better thematic sense) every 30 seconds or so that wield their main weapons but disappear after a while, or gain said survivors as permanent followers every 20 levels or so, mimicking the coffin's weapon loadout. Sky's the limit with what could be done here, really, and it would be quite cute in either case.
Only thing I am not sure about is how it would be unlocked, since "check previously opened coffins" is already a thing.
white comet