Yes.
My first (and still best) exposure to gaming was my older brother's group, that played a bastardized hybrid of 1st and 2nd Ed. AD&D with some homebrew amendments tossed in for good measure. Quite nice, really. It allowed for a lot of flexibility with character classes, including some of the old npc classes out of Dragon Magazine, but not the hokey junk that was released in all those terrible "The Complete -- " and similar awful supplements that 2E spawned.
Anyway, I really wanted to create a witch hunter type character. That is to say someone who basically bounty hunted spell casters for a living. My concept of this was essentially someone with a pretty good set of fighting skills plus a grounding in abjuration type magics.
My first attempt was simply a fighter/incantarix multi-class, using the original 1E incantatrix npc class from Dragon Magazine. That original npc class was pretty well balanced; had its own spell list, that exlcluded almost any sort of purely offensive magics and focused in the defensive and negation type magics I envisioned this character being strong in.
No, I was told my brother/DM, no way would he take a multi-classed incantatrix. I never really did get a good answer why. It wasn't over powered or off the wall compared to what -other- players were running in this campaign, at the time. All told, it was (rather substantially) less powerful than a standard fighter/mage, if you were up against opponents who were not spell casters or enchanted creatures of some variety.
Okay, so I resorted to what we had sometimes done in this particular campaign: I sat down and designed a class from scratch. The class had neither as many magical abilities as the first concept, nor was it as powerful as a fighter in combat. (fighter THACO, but D8 hit dice, no specialization and no extra attacks at higher levels, no armor heavier than chain) This too didn't fly.
Now, sometime later, same gaming group, different DM. We're using a D&D like system this guy was into, called the Arcanum by Bard Games. So, this system actually -has- a witch hunter class. Which this game defines as a dual-classed hunter/mystic (the latter almost something like a psioncist under this system). So, the GM tells me, of the sixteen or so classes this game offers, this is the one he doesn't allow to players, for several reasons. Arrgh!!!!!
Now, cut to some years later. I'm playing in a campaign that uses Fantasy HERO -- a point based system where everybody builds their character from the ground up. I think, at last!! But then I discover this guy wants all the characters in the campaign to be "specialists." That is to say, if you do magic of any sort, then you don't take many martial skills, etc. *Doh*
Again, some years later, I'm playing in a free form writing game online. At LAST... I've found a perfect game to run this character in, after all these years, and there is no pesky system to get in the way this time!
So, I finally get the character in to play. Everything is going well at first. Then the person running the game gets all wierd. Turns out to be a vindictive SOB who goes psycho on anyone who questions his authori-ty. I end up leaving rather than try to work with this prick any longer.
I make ONE more attempt, not too long ago, in an online Planescape campaign. Why did I even dare to hope? The game folds before it ever really starts, because the DM goes flakey and vanishes.
That's my sad tale of the character who wasn't! Probably serves me right. I normally play spell casters. They are my favorite. So perhaps the powers that be just didn't dig me in the role of a witch hunter.