Enji has been described by his son as a prideful and ambitious man driven by his goal to surpass All Might. His desire to surpass the number one hero has driven him in family matters too, having "created" (via quirk marriage) his children in hopes of having an offspring that could surpass All Might.[7]

This drive has followed him his entire life, and repeated failure has plagued him from a young age. He had no interest in the title or the fame of the position, instead wanting to have earned it on merit and ability.[8] This divide in ability and ambition influenced his adult life and decisions regarding his family. Some signs of regret are shown when he contemplates on how his ambition drove his family life into pressure and abuse.[9]

Endeavor constantly pushes Shoto to try and surpass both himself and All Might so he can achieve his own goal of becoming the best. This ambition can be seen in how he ignores the rest of his children and focuses only on Shoto while preventing him from interacting with his siblings.[10] He appeared proud of Shoto when he used his flame side during the U.A. Sports Festival,[11] and when he chose his hero agency for workplace training.[12]

Enji has a bad temper which has been demonstrated on several occasions such as when he saw All Might's true form and shouted in rage at the number 1 hero for hiding such a state, angered that his lifelong goal seemed so pitiful.[13] This was shown again after All Might was forced into retirement and Endeavor would be given the No. 1 spot by default. He destroyed his training hall, furious he was being put into the No. 1 spot without having earned it himself.[14] Then storming off and demanding Hawks foot the bill for the meal they shared after believing he had wasted his time.