My work isn't the greatest and I've already expieranced my work being stolen.

It sucks.
Luckily I had a community behind me willing to testify that it was in fact my work.
These were stolen from me.

The guy made a game using an edited ensellitis as the hero as well as the enemies.
And eventually the game got removed from the site.
It takes patients really.
Because if you go in screaming and yelling about how it is yours, it's just going to go no where.
Easiest way to get your stuff removed from a site is to go directly to the operator of that site.