An overly cheerful character
Tinkles is a character from the adult cartoon Rick and Morty appearing in the episode Total Rickall. She is supposed to be Summer’s imaginary friend, since no one else seems to see her, taking her into the world where it’s never bedtime. But it turns out that Tinkles is an alien parasite and that Summer will actually have to kill her. Despite this, Tinkles retains his overly cheerful and positive personality at all times.