He is an exceptionally talented pilot, despite his young age (at best he is around 13 to 15 years old) and is chosen to pilot the mobile suit, Gundam Barbatos for Tekkadan. He is known for his calm and almost emotionless exterior but cares deeply for his friends and his best friend Orga Itsuka, whom he views as an older brother.
However, he is completely ruthless to his enemies and will not hesitate in the slightest to kill them and often shows zero honor or empathy towards them, even when one of his foes showed reluctance to fight Mikazuki as he was still a kid. This ruthlessness stems from his early childhood when he and Orga had to fend for themselves.
Mika is uneducated, (though not stupid) and is illiterate because of his poor upbringing. He begins to learn as Kudelia Aina Bernstein begins teaching the younger members of Tekkadan. After learning to read, he shows interest in the subject in order to become a farmer. He begins to develop a lot of respect for Kudelia and even kissed her on the lips at one point, shocking her (though she does have a crush on him).
Towards the end of the series, Mikazuki is rendered crippled and blind in one eye due to pushing Barbatos to its limits.