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/growls 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) got him into it and 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, Rock Tonight and Don’t Turn It Down, among others.

His speech as well as the way in which he carries himself is very "delinquent-like", though in reality he is a very nice and approachable guy. 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! My favorite thing about him is how down to earth and kind he is. He's very popular with his juniors, and they all look up to him like a cool older brother. It makes sense why people flock to him! Because of his acting career, he was catapulted into popularity and he’s been working non-stop since then. He gets sick very often, which always worries me a lot. Koki, you’re amazing! But please take care of yourself!