Lammy is the lead guitarist of Milkcan and the main protagonist of UmJammer Lammy. She is normally a very shy and timid girl who has trouble with various things and lacks a lot of faith in herself. The only time she isn't like this is when she has a guitar in her hands, where she becomes completely confident with a bold playing style. On the night before Milkcan's big concert, she has a dream in which she performs alongside Chop Chop Master Onion until she realizes she's been playing a vacuum cleaner all this time. Chop Chop mentions that he had lost his dojo, but it remained in his mind along with its own casino. Following this dream, Lammy is thrown into a series of events getting in the way of reaching her concert in time. Whenever she sees or hears mention of a casino, she is reminded of Chop Chop's words and envisions whatever she's holding as a guitar, allowing her to have the confidence she has when playing. She reappears in PaRappa the Rapper 2, although she isn't playable, and doesn't appear in the anime.