Skeleton T, Puyo Puyo series, various platforms
The easiest opponent in Puyo Puyo is far from being scary or even spooky… until you start to think about where all that tea he drinks could possibly go. WOOOOOoooooooooOOOOOO
Umihara Kawase, SNES, PS1, PSP and DS
One of my all time favorite overlooked games, Umihara Kawase is Bionic Commando if Rad had a bouncy fishing line instead of a robotic arm. It’s super hard, but incredibly fun! Track down the definitive DS version if you can.