Conquest of the Horde

I have question about RP "classes"
Can my OOC Warlock be ICly Keeper of Balance (in Diablo its Follower of Rathma or so)
Like try to keep balance of dark and light/good and bad/death and life.(I'm huge Diablo fan)
And to have most skills of a Warlock with some Light Magic too.
I want my character to be one of them,so I'm wondering is it possible,do I need approval or is it against the RP rules?

It has to be within Warcraft lore. It should say what you can and can't be within the Character Creation Wiki. It would be easiest to just choose a class already in-game anyway, for what I am guessing would be your first character?

I got first character,but I play on two at the time.
I will search the Lore,thanks.

If it's from Diablo, it won't fly in Warcraft lore. They're completely separate universes. (Things like the mini Diablo pet are Blizz goodies, and not lore-based.)