I usually lay out any conditions for what classes/characters I am using right at the start of any given playthrough. Usualy I am trying to handicap myself to spice things up, so special characters are the first thing to go. Though I do enjoy to just power through the game every once and a while.

But even if I go for a 'no special characters' playthrough I allow Mustado because he doesn't offer all that much more than a generic. And theoretically Raffa and Malak, but I think leveling them up from the point you get them in the game makes them significantly worse than generics.