Enid Mettle is one of the main characters in the OK K.O.! series. She is an employee at Gar's Hero Supply & Bodega and works at the register.

Enid is tall with a thin waist, and wide hips and legs. She has light brown skin and thick, waist length purple hair tied in a small spiky bun. She has big eyes, a small rectangle shaped nose, and thin lips. She typically wears a sleeveless blue Gar's Bodega uniform crop top that is torn at the bottom to expose her midriff, black compression shorts, and brown boots, along with white cloth wrappings on the upper half of her arms.

Enid is the most responsible of the main trio even though she is lazy. She tries to use logic and critical thinking to make rational decisions. Unlike Rad, who seems to enjoy making fun of KO, she looks after KO and tries to stop him from getting into trouble.Generally, Enid has a relaxed and peaceful attitude, even when she's in hard situations. However, she is not above to lose her patience and composure when she gets too frustrated.

In the episode "We've Got Fleas," Enid gets a were-bunny form after getting bitten by Crinkly Wrinkly.