I might as well throw my hat into the 'interested' pile here, though I most certainly would be one to put forward the motion of requesting OCs.
Well anyway, here's a list of characters I wouldn't mind playing out, assuming multiple characters is alright.
Ezreal ( Ez/Lux shipper reporting for duty)
a few female characters, though all the good ones seem to be taken.
Draaaaaaaaaaaven! And his smexy mustache!
I'd also be willing to play a few of the monsters/more evil characters for the sake of stirring up drama and potential plot points. The void monsters and the Jayce vs Viktor dynamics being particularly appealing to me. Particularly the 'future civil war' theory which believes that Pulsefire Ezreal comes from a future Valoran timeline where Viktor's started a robotic uprising (battlecast series) against the political forces of Valoran, and the people of Piltover develop the pulsefire systems to combat it, Full Metal Jayce being a prototype.
... I'm such a nerd.