Koto is a fox demon—like Kurama—who works as the referee for the Dark Tournament, though she later transitions to commentary after being replaced by Juri. She also refereed the Makai Tournament. As an idol across both the human and demon worlds, she's got serious celebrity status.
Despite her reputation for seeming to enjoy watching fighters get brutalized during tournaments, Koto's actually more nuanced than that. She's explicitly stated that she only finds violence entertaining when both competitors are actually capable of fighting back. She proved she had limits when she stepped in to stop Bakken from pounding on Kurama during the Dark Tournament—a ten-count that revealed she wasn't totally sadistic. She also happens to have the entire tournament rulebook memorized, which makes her genuinely skilled at her job.
She doesn't have any special demon abilities that we know of, but she's shrewd enough to get her shots in when she needs to. Case in point: she takes occasional jabs at Juri's past as a cocktail waitress, usually while putting on a cute act that masks her actual sharpness.
Chu develops a one-sided crush on her during the tournament, but Koto doesn't reciprocate his feelings. Interestingly, fans often note that she seems to have a thing for Kurama's demon form, Yoko—though nothing ever really comes of it.
Content compiled by AnimeList.moe from publicly available sources.
