I got a character named Von Carstein. He's been around since the 1700s and is a master of Dark Magic and Necromancy. Wouldn't be hard to say he came up with some demonic spells too. When he hits Level 10, I'm opening a villain SG called the Carstein Legacy for Demons and Dark Magic users. They're gonna be an evil version of the Legacy Chain.
I have a blueside character that, while she isn't a mage, is a monster/paranormal hunter. A little bit like the B.P.R.D. in Hellboy. She's knowledgeable about a lot of various rituals and demon lore, and binding a demon and forcing her to do good for the world isn't out of reach for her concept.
Keep it in mind if you're planning on being more heroic minded! 
If you're blueside and willing to set up a little time to chat, one of mine is a possibility. She comes from a family of mages and her magic is based in movement. One of her primary roles is demon hunter, though recently she's learned not all of them need to be killed on site, she'd be willing to give one a chance while still bound if it wanted to do good.
But I'm a big fan of talking OOC and maybe a little IC to get a feel for other players to make sure our RP styles are compatable before committing to making characters dependant on anyone I'm @Kai in game too if you want to hit me up.
Right, I should've been more specific and said I am looking for RP blueside. I'm still making the transition to hero side so theres a few days to play around with what works best.
@sh0kker
This is a good idea; even if you don't like the sound of my character, I may try sniffing out this sort of RP with her elsewhere. :3 Sounds like a good long term storyline that could have some interesting hooks.
Well if you ever hit Red-Side, I have a character who would love to interact with you. Well two, as a matter of fact. Both are magically inclined and could be involved with voluntary demon summoning, or involuntary respectively.
More specifically, a mage character who is knowledgeable in demon lore and demon binding. I would like to RP my demon character as being bound into service by said mage. If you think it sounds like a fun bit of RP let me know!
-PS- also I'd be totally willing to join a SG to make it work, or anything. My character isn't affiliated in anyway so she's free to do whatever!
@sh0kker