They didn't link it but the site they used is Talk to Transformer

I tried it out myself with "Hey I'm Grump" and uh...

"Hey I'm Grump! A small-town bully who loves fighting crime. I'm a bit of an old-fashioned guy, and I hate being told what to do."

Grump is the main antagonist of the NES game Grumpball, which was also the main antagonist of Grumpcade, as well as the main antagonist of Super Mario All-Stars and the first boss of the NES version of Sonic Adventure.

Grump is the primary antagonist of Sonic Adventure 2, in the same manner as Sonic Unleashed.

... This thing really is just a fanfic generator huh