An all-around athlete with 万能

Kanji Explanation: Ability and capability with 能

それでも歩は寄せてくる » Volume 10 » Page 84

Urushi asks Rin about what Ayumu was like in middle school.

うるし:: 「真面目(まじめ)だけど少(すこ)し抜(ぬ)けてていつも真剣(しんけん)で勉強(べんきょう)苦手(にがて)でスポーツ万能(ばんのう)か」; “Serious but a bit absent-minded, always earnest, struggles with academics, but excels at sports, huh?”

In this context, 万能(ばんのう) refers to being an “all-round athlete”.