Often considered to be the face or “center” of the group. He is a professional level beatboxer and has a habit of beatboxing in his speech. He has a wide vocal range, and sometimes even does death metal screams in SUPER★DRAGON's songs. When it comes to music making, he usually participates as a lyricist.

He discovered his love for beatboxing when fellow member Jean (who also has a penchant for beatboxing) showed him a video of the beatboxer NaPoM when Koki was in elementary school. NaPoM would become a huge influence on Koki, and it led to his nickname "Kokipom". Koki often showcases at beatboxing competitions such as BEATCITY Japan (where he even commentated as a guest with NaPoM), and he also performs his own beatboxing sets during SUPER★DRAGON’s concerts. SUPER★DRAGON songs that feature Koki’s beatboxing include Omaejanai, So Woo, and Don’t Turn It Down.

He has a “fanboy” personality, and is a huge fan of the kpop girl group Aespa, often wearing their merchandise or putting their photocards in his phone case. He has an affinity for “cute type” people, and is fellow member Raku’s biggest fan. He is known for being very loud and having over the top reactions. He is very particular about accessories, and even gets custom-made fashion glasses.

A real treasure of a guy. He’s just so good at what he does, he’s so cool! Because of his acting career, he was catapulted into popularity and has become something of a money maker slash audience magnet for the group, and he’s been working non-stop since then. He seems to have an undisclosed medical condition which is probably the reason why he gets sick so often. Koki, you’re amazing! But please take care of yourself!