Shameless plug to a comment I made on a different thread:
Hextech Vel'Koz.
Seeing this guy with a giant Hextech crystal for an eye and just raw hextech magic for his attacks would be SO good. Plus, the guy needs some new voice-over potential. It's weird to see the bright, shiny Arclight Vel'Koz whine about missing the darkness of the Void.
EDIT: This also has the potential for maybe like a ROGUE Hextech skin. Instead of him being like the current Hextech skins we have so far, he could be one that goes around attempting to consume the magic from other sources, giving him a slightly different color palette with similar features to the current Hextech skins. It'd keep him as the all-consuming force he is with the awesome power of Hextech at his disposal. [slayer-pantheon-rainbows]