My two boys insist that I post some of the popular characters found in the cartoon Ben 10.
This is Fourarms

This is Upchuck

This is Upgrade

This is Swampfire

This is Heatblast

This is XLR8

Other characters not shown above are Wildmutt, Ben Tennyson, Krakken, Gwen Tennyson, Ripjaws, Kraab, Man Tennyson, Grey Matter, Ghostfreak, Megawhatt and Vilgax.