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"The Mecha-Ude that has combined (derized) with Aljis and working alongside him to save his comrades. He is one of the Mecha-Udes that came to the human world along with Alma and is Alma's older brother. He doesn't like to show his emotions and prefers to logically go about things." ― Fist's bio from official site[1]
Fist is a Mecha-Ude bonded with Aljis from Mecha-Ude series.