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English name
  • Walter
Japanese translatedTakafumi Kai
Japanese name
Japanese甲斐かい 隆史たかふみ
Base甲斐 隆史
Furiganaかい たかふみ
RōmajiKai Takafumi
  • Male
SchoolDuel Academy
DormitorySlifer Red
Tag ForceEnvoy from Another Planet
Tag Force 2Unknown Chaos
Tag Force 3The Strongest Insect in History
Video game debutYu-Gi-Oh! GX Tag Force
Appears in
PlayStation 2Yu-Gi-Oh! GX Tag Force Evolution

Walter, known as Takafumi Kai in the Japanese version, is a character in the Tag Force series. He is a Slifer Red student.

In Yu-Gi-Oh! 5D's Tag Force 4-6, his name is given to Senshi Teshima.


Tag Force[edit]

Walter teams up with Hayden for the Tag Force Tournament.

Tag Force 2-3[edit]

Walter is partnered with Yan in the Slifer Red Tournament during Tag Duel Sundays.


Tag Force 2-3[edit]

Strongly likes Likes Neutral Dislikes Strongly dislikes
  • Gyoza
  • Foie Gras
  • Pepper
  • Dried Sardine
  • Ham
  • Pineapple
  • Phantom Pepper
  • Fried Shrimp
  • Curry
  • Lettuce
  • Cook's Sandwich
  • Any sandwich not listed
  • Top-Grade Salad
  • Jam
  • Bean Paste
  • Grape
  • Soba Noodle
  • Ramen Noodle
  • Chicken
  • Croquette
  • Spicy Fish Egg
  • Goya
  • Kimchi


In the first two Tag Force games, Walter uses Alien Decks. Compared to Jaime, however, Walter's Decks as a whole are more oriented towards protecting his cards and locking down the field.

In Tag Force 3, Walter switches to Worm Decks.

Tag Force[edit]

Envoy from Another Planet

Tag Force 2[edit]

Unknown Chaos 1
Unknown Chaos 2
Unknown Chaos 3

Tag Force 3[edit]

Walter's Decks in Tag Force 3 are titled "The Strongest Insect in History" (史上最強の虫けら, Shijō saikyō no mushikera)

The Strongest Insect in History 1
The Strongest Insect in History 1 - Side Deck
The Strongest Insect in History 2
The Strongest Insect in History 3