Update!

Rolled stats: 8, 12, 12, 15, 15, 17. Hurray!
Other players: most likely monk (no subclass known yet) and fighter (no subclass but PAM/sentinel build). Idea is (but not certain yet) that by the time we get to level 9 another player joins, probably arcane trickster rogue.

Not much closer to a decision myself though. On the one hand, a versatile 'broad' caster could offer a lot of support here (there's no face, no healing, area damage, and little utility it seems, though that also depends a bit on subclasses / feats / races - at least till the rogue joins). On the other hand, might be fun to go without a (full) caster... less obvious solutions to problems.

More ideas based on stats/party?