Wu had a virtuous personality even as a child. He couldn't stand to see his smaller classmates get picked on, for example. He'd even stand up to the teachers if he thought they were playing favorites. That often got him into trouble at school and at home.
然而個性中照顧人、疼惜人，喜歡當老大的「九怪」性格，譬如看不慣同學大欺小、強凌弱而出手，甚至常因老師偏心或無法以身作則而和老師頂撞，都讓他在學校與家中受盡「管教」。