Calm, collected, and reliable, he's well-liked by his peers. He is also very perceptive, as he is able to easily recognize Supernatural happenings and identify them.

In the first chapter, Nene describes Teru as handsome, smart, and an amazing person who is kind to everyone: the prince of the school. Teru himself, however, does not seem to be conceited over this reputation. After hearing Nene's compliments about him, he just thanked her and apologized for surprising her.

Nene also compares him to television stars or idols, as just seeing him is enough to make people happy. His kindhearted personality attracts not only girls his age, but also boys. He is especially kind towards his siblings, his brother Kou and his sister Tiara, as he almost always does whatever they ask of him

Despite his seemingly kind personality, he also can be sadistic and harsh sometimes. He's especially strict with Akane, the vice student council president; Teru isn't afraid to punish him whenever he makes mistakes.

Teru seems to think that all Supernaturals are evil beings and should be exorcised. He only has a few exceptions, such as Mokkes, as he seems to neither particularly hate or like them — he tolerates their presence because Tiara likes them.

His style of exorcising seems to heavily rely on making the enemy helpless, then proceeding to exorcise them, which sometimes comes across as a cruel method to others.