|Introduced in||"BMO Noire"|
|Voiced by||Niki Yang|
|"Do you know what Ice King means?!"|
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Ronnie is a mouse that lives in the Tree Fort. His only known appearance is in "BMO Noire," where he is dating Lorraine, but finds out that she's cheating on him with Bebe. Ronnie gets jealous and kills him by taking out his batteries. Ronnie is later killed in a police shoot-out and set up by Lorraine as the patsy for the whole thing. Ronnie looks like a regular mouse.
However, this could all be a part of BMO's imagination, as suggested in "BMO Noire."