Gladiator (Jenny Everywhere Took My Breath Away)
A burly non-human gladiator with a reptilian appearance fought Jenny Everywhere multiple times in a fighting pit in one universe. After she defeated him by shifting him to other dimensions, he showed up to their subsequent would-be-final confrontation wearing a dimensional phase stabilizer harness that prevented him from being shifted against his will. He came close to killing Jenny, but the harness didn't prevent her from using her powers to summon more items into the pit. After using it to put on some scuba gear, she shifted a large amount of water into the arena, flooding it; she swam up effortlessly to claim her victory on the surface while her opponent was still floundering near the bottom. (COMIC: Jenny Everywhere Took My Breath Away)
Behind the scenes
Given his clear familiarity with dimensional technology, and the variety of species in the audience of the fight, it is not clear that Jenny's opponent is in fact native to the unnamed universe in which Jenny Everywhere Took My Breath Away takes place.