Momota serves as Yusura's animal companion after she rescued and nursed it back to health from injuries, forging a powerful bond. This event cemented Momota's deep attachment and unwavering loyalty, leading it to rarely stray from Yusura's side. Physically, Momota possesses pink hair and white eyes, featuring a prominent X-shaped scar on the forehead and a distinctively hairless posterior. This specific trait inspired the name "Momota," derived from "peach-like buttocks" in reference to its shape.

The character habitually perches on Yusura's shoulder or conceals itself within her clothing, especially near her collar. Momota exhibits a mischievous and often diabolical demeanor, frequently grinning widely and appearing scheming, particularly when planning or executing pranks. Its primary form of interaction and defense centers on flatulence, employed offensively to deter enemies, create smokescreens, or signal with smoke, serving various tactical purposes.

A defining aspect of Momota's behavior is intense jealousy, especially directed at Yonezawa, Yusura's kappa boyfriend. This jealousy surfaces during Yusura's interactions with others, prompting Momota to disruptively use its abilities. Despite this trait, Momota remains a dedicated companion, leveraging its unique skills to support Yusura and her allies in diverse situations.