Thought this would be a fun new thing XD Candidate for most evil character in anime, manga or other media! First off (until I can think of anyone elseXD):
Marshall Marian Cross!
Escaped from the Order to hunt Akuma’s on his own, and he even took in a poor child (Allen) that had no one else. Seems like a good guy right? But then we get to the bad parts… he is a womanizer, and he uses all his money on drinking and women, he exploits his lovers for money to continue on, and he uses the poor 12-15 year old Allen to get more money. He is even known for leaving the debts to be collected by his enemies.
Here is some clips to proove his evilness XD: