u/Gold_Night7413 — reddlx

The Giffany Connection: If the Tails Doll entered the Gravity Falls universe, it would likely be through a cursed piece of tech, similar to the sentient dating sim Giffany. Perhaps Soos finds a discarded "Sonic R" cartridge at the Mystery Shack, and once he starts playing, the Doll manifests in the real world as a physical, hovering cryptid.
The Mystery Shack’s: DefenseThe Shack is protected by Unicorn Hair and various enchantments. While the Tails Doll is a digital ghost, the journals would likely classify it as a "Phase-Shifting Poltergeist." Dipper would probably try to find its "source code" or a specific frequency to neutralize it, while Mabel would likely try to put a sweater on it (which might actually be its weakness).
Bill Cipher’s Interest this happened during Weirdmageddon, Bill Cipher might find the Tails Doll hilarious. He’d probably treat it like a pet or one of his interdimensional henchmen, using its "creepy stare" to paralyze the citizens of the town.4. The "Curse" Mechanics Gravity Falls fashion, the "Tails Doll Curse" wouldn't just be an urban legend—it would be a literal, measurable phenomenon.

The Symptom: Hearing the song "Can You Feel the Sunshine?" backwards.

The Cure: According to a lost page in Journal 3, you might have to defeat it in a race or "unplug" its red gem power source.What other character do you think would be the first to notice something was wrong—Dipper with his journals, or Soos with his video game knowledge?