「ヤマダ　ユキヒロ/Yamada Yukihiro」 双子兄弟の弟で、嫌ながらも常に兄と比べらされ、普通は面白くて行儀正しいな男の子だが、いざ誰かと比べられればすぐ喧嘩をふっかける性格になった。 The younger of twin brothers, constantly compared to his older brother, even though he doesn't like it. He is usually a funny and well-behaved boy, but when he is compared to someone else, he immediately starts fighting. 普通に兄との仲がいい。 Close with his brother.