Good mage to main?
I'm looking to main/one trick a low mobility mage that could be played in and off role. Who do you think is a good choice thats fun, and rewarding?
I'm looking to main/one trick a low mobility mage that could be played in and off role. Who do you think is a good choice thats fun, and rewarding?

goes with pretty much any comp and multi lane
Hey man I think
is a great description of what you are looking for. He is simple to understand the basics of his abilities yet he has a very high skill cap where you feel like a geometry MASTER hitting the most ridiculous abilities. He is immobile and his immobility can be exploited yet when mastered you will stomp people turning on them with very low HP with a combo of damage they would not expect. He is VERY rewarding to learn :). In gold 1-low plat I find Vel'koz very viable in: Mid and Support and also once you improve you can even woop out a strong Vel'koz APC pick
Swain, Vlad, and Brand are probably the best choices, although Brand would probably be the most annoying to learn and isn't so great in mid.
If you're willing to put up with the frustration, Ziggs is pretty rewarding and fun once you actually learn how to land his insanely dodgeable abilities. Ult does over 1000 damage alone if it hits anything.
aren't great botlane carries, but the can be played as carry supports.
Is great. I've had no luck with her in botlane, and I don't think her manapool can do it honestly, but her toplane can be passable. You'd have to learn her in mid awhile first.
veigar
fun.. can be played bot
also good..
never ceases to amaze me how boring league is for mage players..
Right now one of the best 5 mages is low mobility, good in mid, passable in top, and great bottom. 
Veigar