Toto is pure-hearted, empathetic, and straightforward. He does not hesitate to help others in need, paying no heed to what problems it may cause; he just wants to do what he thinks is right. For that reason, his body often acts before his mind.

Though many (initially) believe he is unsuited for detective work and he is mostly delegated to paperwork, Toto is very dedicated to his occupation, wanting nothing more than to ensure the safety of the citizens. He greatly values life and often prays for the victims of his cases. Totomaru works hard and much, pulling all-nighters if he has too. This makes him, ultimately, an integral part of his division.

Furthermore, Totomaru says what he thinks without hesitation and voices his thoughts out loud without realizing it. According to Ron Kamonohashi, this is an indicator that he was a spoiled child and brought up in a refined environment. Toto also moves his mouth when he talks to himself.