Tails Doll (テイルス・ドール Teirusu Dōru?) (also mistakenly called Puppet Tails or Tails Puppet) is a doll version of Tails built by Dr. Robotnik. He is comparable to Tails in the same way that Metal Sonic is comparable to Sonic. The Tails Doll has a metal rod protruding out of the top of its head that leads to a red gem that seems to control the robot's movements. The Tails Doll appeared only in Sonic R, as an unlockable character on the Radical City course by collecting 5 Sonic Tokens, finishing in at least third, then beating him in a race.
Tails Doll has poor handling, average acceleration and average top speed. He is the slowest character in the game, but he can glide over water like most of his metal allies, and he has a strange floating ability as his "air action", allowing him to remain airborne longer than Tails can.
As a last resort, Eggman manufactured this to catch Sonic unprepared. This, except for the power plant embedded in its head, is a mere stuffed animal, whose meager form nevertheless exhibits considerable ability in races due to its lightweight design. Still, it is also able to float in the air for a long time.
- Although not the same character, in Sonic Adventure, there are doll versions of Tails, Sonic, and Knuckles used as target practice dummies for Eggman's robots (such as E-102 Gamma in his tutorial level). They appear incapable of moving on their own as the Tails Doll can.
- In Sonic Rivals, the doll version of Tails from Sonic Adventure appears on a collectible card named, "Tails Doll."
- Scratch and Grounder once tried to lure Sonic into a trap using a Tails-shaped doll in "Grounder the Genius", an episode of Adventures of Sonic the Hedgehog, the doll was later re-used by Katella in the episode "Zoobotnik".
- The Tails Doll makes a brief cameo in Archie Sonic the Hedgehog #134 along with Pyjamas, Ebony, Shortfuse and Tekno. It appears next to Big when King Max starts giving the announcement that Sally Acorn is going to rule the kingdom in his absence. He also appears on the last page of story 1 in the top left section of the audience. He then later reappears in issue 231 as part of an attack operation by Doctor Eggman.
- Tails Doll appears in the Japanese Sonic app Sonic Tweet as a card that can be won.
- Tails Doll is popular on the Internet, where people make up violent stories about him. His scary nature appears to be reflected by Archie Comics plans for him, as evidenced in a recent "Sonic-Grams" in which the person answering the letters said he couldn't mention how Tails Doll would impact the story because he was too scared.
- In the game Sonic Colors, Eggman's Sonic Simulator features two Virtual Hedgehogs with red gems on their heads similar to the Tails Doll's.
- In Sonic and the Black Knight, Tails Doll makes a cameo in the fan art section.
- Writer Karl Bollers intended to use Tails Doll as an antagonist in the Archie Comics series following Sonic's year long absence in space. Tails Doll would have been built by an amnesiac Nate Morgan to serve Metal Sonic. The plans were dropped after Bollers left the comic following Sonic the Hedgehog #134.