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English name
  • Seydina
Japanese translatedKoichi Shiraishi
Japanese name
Japanese白石しらいし 光一こういち
Base白石 光一
Furiganaしらいし こういち
RōmajiShiraishi Kōichi
  • Male
SchoolDuel Academy
DormitoryObelisk Blue
Tag ForceAlmighty Light
Tag Force 2Ruling Light
Tag Force 3All-Ruling Light
Video game debutYu-Gi-Oh! GX Tag Force
Appears in
PlayStation 2Yu-Gi-Oh! GX Tag Force Evolution

Seydina, known as Koichi Shiraishi in the Japanese version, is a character appearing in the Tag Force series. He is an Obelisk Blue student.


Seydina is the leader of the Six Attribute Deck Masters, a group of Obelisk Blue students who each wield a Deck of one of the game's six Attributes. The rest of the group consists of Truly, Celia, Brown, Dante and Rock.

Tag Force[edit]

During the mornings, Seydina and his group can be found at the Duel Field, while after class they are outside the Obelisk Blue Boys Dorm.

Seydina teams up with Truly for the Tag Force Tournament.

Tag Force 3[edit]

Seydina and Pablo Tag Duel against the player and Syrus during the second event of any of Syrus' stories.


Tag Force 2-3[edit]

Strongly likes Likes Neutral Dislikes Strongly dislikes
  • Dried Mackerel
  • Dried Sardine
  • Chicken
  • Gyoza
  • Ramen Noodle
  • Jam
  • Sausage
  • Chestnut
  • Ham
  • Steak
  • Hamburger
  • Bean Paste
  • Cook's Sandwich
  • Any sandwich not listed
  • Pepper
  • Cream
  • Salmon
  • Lobster
  • Garlic
  • Phantom Pepper
  • Tofu
  • Kimchi
  • Normal Egg


Seydina uses LIGHT Decks. He focuses on the "Batteryman" archetype in the first game, while his Decks in later installments revolve around "The Creator" and "Card of Safe Return".

Seydina's Decks are titled "All-Ruling Light" (すべてを司る光) in the Japanese version of all 3 games.

Tag Force[edit]

Almighty Light ★4

Tag Force 2[edit]

Ruling Light 1 ★7
Ruling Light 2 ★6
Ruling Light 3 ★6

Tag Force 3[edit]

All-Ruling Light 1 ★6
All-Ruling Light 2 ★7
All-Ruling Light 3 ★8