Noun, Na-adjective (keiyodoshi)
charm (e.g. of an innocent child); lovable nature
先輩は、嫌味なくらいの完璧超人でしたからね。だから逆にその「癖」は先輩の可愛げ・・・というか、チャームポイントでしたよ。You were always a perfect 'superhuman' to an infuriating extent, and so that 'habit' was actually one of your cute, or rather charming, attributes.
Also written 可愛気【かわいげ】