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Roboppy (ロボッピ)
He is a robot that worked as a maid at Yusaku's house. Built and programmed by Yusaku, Roboppy is very loyal and respectful to him. Yusaku cares and visibly has a fondness for his house cleaning robot, as he warmly smiled and petted Roboppy affectionately as seen in his flashbacks. Roboppy does describe Yusaku as being "a little cold hearted."