|This article is about a/an ally in Kamen Rider W.|
Santa-chan (サンタちゃん) is a mysterious man appearing throughout Futo, usually promoting local companies, and is always dressed like Santa Claus. Though he is seen in a Santa Claus outfit almost all the time, he dons a reindeer outfit on Christmas Day instead.
Similar to Watcherman, Santa-chan usually gives Shotaro Hidari, information regarding what case he is on, but to a lesser degree than Watcherman. True to his costume, Santa-chan gives out gifts, which always seem to help out the recipient.
In Kamen Rider W Forever: A to Z/The Gaia Memories of Fate, Santa-chan finds the T2 IceAge Gaia Memory which forces him to become the T2 IceAge Dopant. He and Watcherman as the T2 Violence Dopant are freed when Kamen Rider Double LunaJoker use the Joker Strange Maximum Drive. They are then placed in a free clinic for observation during NEVER's attack on Futo City.
One year after the final battle with the Utopia Dopant, Santa-chan is seen as the owner of a pet shop that Shotaro visits to buy Mick's cat food, breaking up a fight between Shotaro and an unnamed employee who is later revealed to be the Energy Dopant. He is last seen in the series telling the unnamed employee right after Shotaro left that he (Shotaro) is a man who is the face of Futo that helps others no matter the danger.
- Height: 260cm
- Weight: 132kg
As IceAge Dopant, he has the ability to make absolute zero ice from attacks to clones.