Hoops as Torch of the Dreadnok motorcycle gang, from G.I. Joe.
I originally wanted to use the Diamond Dogs (Fido, Rover, and Spot) for the three Dreadnok gang members, but Google Imagen has serious trouble with non-pony MLP designs. So I fell back on the three Cloudsdale boy bullies instead.
I chose Hoops for Torch mainly due to similar hair color.