Healer.
Like, the pacifist kind. Not the "can nuke people late game" kind. Playing a pacifist healer in Nethack suuuuucks, and moves over to beast tamer territory.
Final Fantasy berserker is bad when it's forced; less so when it's an evasion tank (like X-2, where they were cool as hell.)
Most boring goes to buffers/debuffers. Lucas wasn't BAD in Mother 3, but man is his playstyle boring compared to even Boney who literally can't do anything but "goes first" and "attacks."