Tortavi is the shell-less turtle hybrid species that Ket belongs to, as well as some unnamed upcoming characters.

The name “tortavi” comes from “tortoise” (turtle) and “avian” (bird).

A tortavi is a green turtle with no shell and many simplified features. Tortavis are often mistaken for frogs, though tortavis have beaked mouths and tiny tails, among other differences.

Despite looking like reptiles or amphibians, tortavi are functional mammals with all the normal parts.