| Seiya Kubo |
|Voice Actor|| 小平有希 |
|Signature Card(s)||Codenight Star in the Love, Codenight Congratulation, Wedding, Zenith of "Celebration"|
He is a member of the YA.RA.SI band, playing as the singer.
He seems like a very cheerful and easygoing boy, but is actually extremely insidious and malicious. His speeches are often ruthless and cold, such as comparing his enemies with insects.
He calls Maria Ave a worm and Nanmo Nai a pillbug. He dueled Nai and won by removing Nai's Guardians using Wedding, Zenith of "Celebration" and Codenight Congratulation. Then he battled Leo Hyakujuu and destroyed Leo's 2 blockers sent using Heaven's Gate using Codenight Congratulation. Then he used Wedding Gate to put Kacha Magunsan, Chalice of Heaven Descent and Codenight Star in the Love which destroyed his Trueangel Leo the Star and reused the Wedding, Zenith of "Celebration" he returned using Eternal Omega. However, it only gave Leo more shield triggers due to Lionel, Zenith of "Ore" and Seiya was defeated.
- Ashliger, Holy Dark Beast
- Borderline of Truth and Falsehood
- Codenight Congratulation
- Codenight Engage Ring Double Cross
- Codenight Rice Shower
- Codenight Star in the Love
- DNA Spark
- Kacha Magunsan, Chalice of Heaven Descent
- Kariisabira, Magical Heaven of Toasting
- Terror Pit
- Wedding Gate
- Wedding, Zenith of "Celebration"
Leo Hyakujuu ● Maria Ave ● Gou Tetsujo ● Seitaro Gero ● Yamamoto Elegance Kumiko
Gennai Saiba ● Ragan Hiyama ● Yukiko Kamakura ● Ran Ohata ● Mei Midoriyama
Dan Danda ● Hiroshi Taihei ● Nanmo Nai ● Toriyama Siblings