Kitten is a miniature porcelain kitten and is best friends with Fox. She is often seen standing on Fox's head, and he treats her like his own child. She's highly intelligent and sneaky for a tiny kitten like her, and often says, "Mewmewmew!"
She has the power to revive shortly after an event that would kill her or any others, up to eight times, leading to a total of nine lives. By Island of Dragons, she has seven remaining - one from sacrificing one life to save Lhasa's life, and another from being stepped on in a battle.
Kitten was a gift to Mr. Today and his twin sister, Justine, from their mother so they can remember her. Mr. Today eventually brings her to life, but during the process he forgot to make her speak so she only says, "Mewmewmew!" This can only be understood by a cat like Simber, but Fox believes he is one and always tries to translates her mews to the best of his ability.
- Fox and Kitten seem to badly overreact to not knowing each others' well-fare, as they cry for joy when Fox realizes he doesn't know where Kitten is and they find her sleeping in someone's shirt pocket.
- Kitten is the smallest known golem in Artimé.
- Alex describes Kitten as a marshmallow