I'm curious about what characters people don't bring to that dungeon. In my case, I always leave Umaro and Gau out because I can't stand their berserk tendencies.
People leave someone behind other than Umaro and Gau?
I mean, why would you do that? Everybody else is super freaking awesome. Umaro can't use magic and Gau takes an eternity to make worthwhile (unless you're playing the SNES version and give him the Merit Badge or whatever.)