FatKat is a character based on the mascot of FatKat, the company responsible for the animation for the Happy Tree Friends TV Series.

FatKat is a blue cat with a white-and-orange shirt and a bandage on his tail. He has one tooth protruding from his mouth (similar to Cro-Marmot) instead of the usual buckteeth.

He made only one appearance, which was a cameo in the HTF Break named Take Your Seat. It is unknown whether or not he will appear again.