Sorry for the late reply and you might have figured it out by now. You cant autojoin groups by entering a lobby at the moment so you need a premade group and create the room afterwards. Just ask around the LFG chat to find players.
maybe a skull with crossed harpoons would fit the bandits. I-...I mean my nephew drew this insanely well cropped logo:
I don't really have any ideas for twilight but you might want to look at "twilight willsapper" for some inspiration