Gomu Mario, more known by his nickname, Sea Lion, is a Remless sent by Fish Eye to fight the Sailor Scouts. He has the appearance of a beach ball, and is the cousin of Puko. He mainly attacks by bouncing around at high speed. He appeared in Sailor Moon Super S Episode 13, Clothes Call.
Fish Eye was about to kill a fashion designer when she didn't find Pegasus in his dreams, when Sailor Moon and Sailor Mini Moon came to stop her, so she summoned Sea Lion to fight them. A sea lion (undoubtedly part of the Dark Moon Circus) was initially bouncing him on his head, but as he attacked Sailor Moon and Sailor Mini Moon, it bit Fish Eye as she left through a portal, taking it with her. Sea Lion gained the advantage against the two Sailor Scouts before Tuxedo Mask attacked and deflated him. As he attacked again, Sailor Mini Moon summoned Pegasus with Crystal Twinkle Bell, and Sailor Moon destroyed Sea Lion with Moon Gorgeous Meditation.