He's an AP sustained damage mage.
There was a video on IGN I got linked a while ago going through his skills but I'm not digging up the link, but -
Passive -
Free item that augments one of your skills
QWE -
Laser that drags along a path like Rumble ult
Zone that has a stacking slow, at 3 stacks you get stunned
Quick bolt that damages then shields you
R -
Cloud of lightning that kills stuff as it moves. Like a mini Fiddlesticks ult.
There was a video on IGN I got linked a while ago going through his skills but I'm not digging up the link, but -
Passive -
Free item that augments one of your skills
QWE -
Laser that drags along a path like Rumble ult
Zone that has a stacking slow, at 3 stacks you get stunned
Quick bolt that damages then shields you
R -
Cloud of lightning that kills stuff as it moves. Like a mini Fiddlesticks ult.

heres the video xenasis was talking about http://www.ign.com/videos/2011/12/19/league-of-legends-viktor-gameplay-commentary
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Champion Sneak Peek - Viktor, the Machine Herald
Posted by Average Gatsby on Tue, 2011-12-20
If you’ve ever perused a book on ethics, you know that it’s important to give credit where credit is due. This happens to be especially important when mad scientists are involved. Hypothetically, if you were to construct a Great Steam Golem only to find that some other scientific type had claimed your creation as his own, it might cause you to come a bit more unhinged.
Meet Viktor, the Machine Herald. Not only is he the scientist who invented Blitzcrank, but he also had his creation usurped by his fiendish professor. Now, people cope with grief in different ways. Some people cry, some people binge, and some people start replacing their body parts with robotic limbs. I guess we’ll leave it up to you to decide how you think Viktor deals with his problems.
Thank you to Blowfeld for for being the first to post this YouTube commentary courtesy of IGN in this thread.
Thank you to strYker for starting this thread containing a link that made me laugh a lot and also includes a stat list thanks to thanks to MDC.