A cool and well-respected upperclassman, Akihiko is serious and determined, as well as cracking small jokes on small occasions. Of all members of the group, he is the most prone to sarcasm, one instance being if the protagonist talks to him while he and Junpei are taking a break from studying for first semester midterms, stating that Junpei isn't studying for his exams as Mitsuru told everyone to go back to their routines.

Akihiko also has an aggressive side, which he usually demonstrates when dealing with Shadows. He never gives up and always tries to get stronger in order to protect what is dear to him and feels guilty for not being able to save his sister, Miki, from the fire. As he puts it, he knows what it's like to feel powerless and he never wants to feel that way again, though this often results in him overworking himself due to feelings of self-doubt.

He acts like an older brother for the younger S.E.E.S. members and especially in Persona 3 Portable if the player chooses to play as the female protagonist, Akihiko is shown to care a lot about her. This fits with his Arcana being the Emperor, which represents fathering and relates to leadership and decision-making skills.

Akihiko is often depicted as aloof, and, in some cases, completely unaware of his fanbase of female students, who often follow him around school. He finds this irritating and will sometimes complain to the protagonist about it, saying they talk so much that they give him a headache.