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Banmaru Zoushi (造師蛮丸)
Banmaru Zoushi is a gadget master allied with Tenma Ganzo who aspired to become a Juttensen. After Rushuna defeats him he joins Touka, drawing up plans for the reconstruction of Peach Blossom Tower. Banmaru later constructs a massive cannon using the Peach Blossom Tower as a base that can fire a shell all the way to the capital to deliver Touka Kurenai there quickly after she receives Mikan's balloon-delivered urgent request for assistance. source: wikipedia