Sengoku is a rather shy boy who gets embarrassed easily. The slightest thing will make him cower in fear, especially things to do with horror or insects. Sengoku is very smart and serious, normally ranked #1 in terms of grades in the school. He enjoys reading and has an incredible level of concentration while doing so, the point of ignoring everything else going around him. He is generally not very expressive with his emotions. The sole exception is his anger or irritation, which he shows all the time as he is the Student Council President. Even though he makes threats and gets angry towards those breaking the rules, he doesn't actually like doing so.

Kakeru possesses a smooth, mid-ranged voice. He uses a slightly commandeering tone, which tends to morph sporadically into childlike intonation whenever he’s not on student council duty.