I'd call it Bowl Brawlers or something like that. Two factions that battle within one sewer system, often one toilet. Could go in the "arena" direction like a wrestling toyline.
To clearly avoid that possible ambiguity, I'd just make it a GI Joe parody.
Joe Colon, Duke Dookie, Dumpestro maybe.
Lil Scarlett [spoiler]pooptart[/spoiler] and Baroness Blumpkin
Looking at 1982 Joe names, most of them kinda sound like crapping anyway...
Breaker, Clutch, Grunt, Grand Slam, Torpedo, Cutter, Deep Six, Ripcord, Roadblock, Avalanche, Blaster, Blocker -- jeez!
Also, I am reminded of this classic Spencer's poster. Not a very clear image, but you get the gist.
Edited by steverotters, 04 July 2015 - 10:09 PM.