Ky Schweitzer holds the rank of lieutenant general in the Black Gema Gema Corps, an organization opposing the main protagonists under Piyoko's command. His canine traits include pointed ears, a tail, and an affiliation collar. He sports purplish-blue hair, purplish-red eyes, and wears glasses. Unique uniform accessories feature a toothbrush and cup, complemented by morning glories woven into his hair.

Within the corps, he collaborates with Rik Heisenberg and Coo Erhard as joint caretakers for Piyoko, occupying the middle role in this trio. Professionally, he works as a dentist. Schweitzer balances seriousness and responsibility, typically serving as the group's most level-headed member, though he panics when plans unravel. This contrasts his gentle, nurturing demeanor, earning him the "Mommy" moniker.

He deeply cherishes Piyoko, craving her praise and affection. Any attention or compliments she directs toward others triggers visible distress or jealousy in him. His commitment to her well-being and the corps' objectives remains unwavering.