Jinjle is a small white mouse that was won by Merja Acrid in Bucktuck City from a game during the Owlspring Festival. It is a small, timid mouse that Merja carries around in her pocket, subjecting him to the dangerous scenarios she gets herself into.
The mouse is used to going long periods of time without being fed. It has also garnered a lot of interest from the owl Berdo, yet another constant peril it faces. At one point, the demon Brulach was nearly siphoned into Jinjle's body.