Dat Boi is a super-powerful and super-green MLG fighter. He appears as a frog riding on a tricycle, and he and Sanic have worked together and clashed many times. Dat Boi can ride tricycles super-fast, and can travel the whole world on a tricycle in just a few seconds. Dat Boi's tricycle also has memey properties, so he can travel on it in the sky without falling and breaking his dank.
Dat Boi and Sanic first met in the MLG/YTP Total War 1, and clashed with each other, but became friends later. They now team up a lot and are good friends.