Most Helpful Guy
1. The one in your picture. (I honestly have no earthly idea how can someone love such a character, but suit yourself.)
2. Angelus from Buffy. I have to admit I'm a bit unsure about this one since his alter ego with a soul, Angel is very likeable, but the soulless "version" is quite abominable.
3. Bill Cipher. One of the most evil cartoon characters ever created, this insane piece of dorrito has feats like this: (second picture). I'm glad he doesn't exist.
Most Helpful Girl
Angela and annoying Holly from Power
Beth and her mama from Passions
Jada Pinkett annoying daughter in Hawthorne
Others for sure but can't think right now.