I wish I could say it was someone with a bunch of details, but it's Eugene. Eugene and all his proportions that are really hard to maintain whether he's 13 or 25 At this point I believe he'll forever be the hardest character to draw x)
For me, it's Cedric from Cebu Under Attack. I must maintain the realism and emotion of his character.
I have trouble drawing my main character, Bobbie, at times. I've gotten the hang of it for the most part but his short hair took some getting used to