BG2 fans are split on Jan who was a comic relief character. I love Jan and I had him in most of my parties. Minsc was about 50 percent humor.
But you could also assemble downright morose murder party -- Valygar musing on whether he was right to murder his parents, Keldorn depressed after he murdered his wife, Anomen repenting for having murdered Saerk, non romanceable Jaheria musing about her murdered husband.
I think they've got the tone right -- once Minsc comes we'll get some humor. BG is more Star Wars than Guardians of the Galaxy or Spaceballs.