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A former Rocket Knight Leader, who at one point adobted and raised Sparkster (and presumably Axel Gear as well) to be a Rocket Knight after Sparkster became orphaned as a result of an unspecified war that took place. One can assume that this war had to do with the Devotindos Empire.
According to the Instruction Booklet for Rocket Knight Adventures, Mifune was severly injured by Axel Gear, who had betrayed the Rocket Knights, during Axel's attempt to steal Ancient texts containing important secrets of the Rocket Knights. However the book never makes it 100% clear if Axel actually killed Mifune. As His fate is described as being "destroyed", "permanently disabled", and "severly injured" in different parts of the game's back story. Many assume that he eventually died from his injuries as he is never seen in the games, Nor is there any official artwork of Mifune Sanjulo.
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