Mr. Mouse was a mouse which has been trained by Oboro to become a valuable helper in his investigative work. Indeed, Mr. Mouse was able to follow suspicious people without getting unwanted notice, and look for clues in the tiniest places. One instance where Mr. Mouse's work became crucial, is when Freyjadour Falenas had Oboro and his detective agency look into the mystery of the uprising of Lordlake. The clever little animal could track down a shady man threatening Norden for his silence, and lead the detectives to Salum Barows' Mansion, revealing who was really behind the whole plot.