Time to start working on this contest
I chose Karthus, mostly because i like dark themed characters, but i'm still not sure in which direction to take the character, if to stick with Classic Karthus or make a skin on my own based on Mind Flayer/Cthulhu with some cultist elements and candles. I'll probably give a shot to this last idea at first and see where it goes, if it doesnt work well enough i'll revert to classic Karthus.
By the way... name of the skin could be "Kathulhu"?
Here a quick reference collection to keep track of the main ideas