For example..
Let's take a class.. called.. Shaman.
Healing (B), Buffing (B), Information Gathering (B), Debuffing (C), Repelling Spirits (C), AoE Damage (C), Physical Combat (D), Shape-Changing (D), Social Skills (E), Stealth (E).
Great Support class. Good at healing, gathering information from spirits, buffing. They can debuff enemies fairly well, get rid of nasty ghosts and spirits, even throw in the occasional area damage spell. It is possible for them to fight, but they aren't very good. They can shift their shape under a few restrictive conditions (No magic while in different shape, only animal forms, lasts only until sun rise or sun set, etc..).
The constant whispers of spirits around them cause people to be on edge though, as well as make stealth nearly impossible.
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather