Tamaki is extremely shy and introverted, especially around audiences. He gets nervous very easily when talking to other people. If his anxiety gets the best of him, Tamaki will often face away and lean into a wall to hide his face from others.[5] This also happens whenever Tamaki has a bad feeling or feels insulted.[6]

While his physical abilities and Quirk are outstanding, Tamaki is still very socially awkward and lacks confidence in his own powers. He apparently feels overwhelmed by the pressure to be perfect and this has damaged his self-esteem.[7] Tamaki is quick to point out when others are being too optimistic in his pessimistic opinion and is unable to recognize his own achievements. His pessimism is a direct contrast to Fatgum's optimism. Even after being complimented by Fatgum, Tamaki often takes his mentor's praise for taunting.[8]

Despite his timid heart, Tamaki is fully capable of showing flashes of bravery. Even though he's always been a shy and reserved boy, Tamaki was able to hone his skills and climb the ranks into one of U.A.'s Big 3. Mirio Togata is a big inspiration on Tamaki, and their cooperation throughout their lives has lead Tamaki to establish his own set of stern beliefs which he will uphold and vocalize.

While fighting against the villains, Tamaki pushed himself to his limit so that he could uphold the expectations set on him by Fatgum, Mirio, and others who believe in him. Tamaki voiced his disapproval of the way Toya Setsuno, Yu Hojo, and Soramitsu Tabe consider themselves expendable to Overhaul, but he appears to understand the bond between allies very well.[11]