Tats

Tats is minor character and antagonist in Gravity Falls.

Season 1
He is first seen in "Headhunters," when he prevents a miner from entering Skull Fracture. However, he then lets Dipper and Mabel inside the building after seeing their fake "IDs."

In "Bottomless Pit!," he appears in Dipper's story "Voice Over," and chases after him out of anger for a prank call Dipper had made earlier.

Later, in "Gideon Rises," Tats makes another appearance as he and another thug are hired by Gideon to be his personal bodyguards; Gideon makes use of them throughout his grand scheme until they are knocked out by the gnomes.

Season 2
In "Society of the Blind Eye," he is revealed to be a member of the Blind Eye Society. He, along with with the rest of the members, has his memories erased.

When Mabel and Dipper traveled back to the Gravity Falls of ten years prior in "Blendin's Game," Tats was seen at the Tattoo parlor, apparently receiving the first of his many tattoos.

In "A Tale of Two Stans," a young tattooless Tats is seen buying groceries at the Dusk 2 Dawn convenience store. He has no lines and appears greatly different, being several inches shorter in height, with dark hair and a flat top cut and wearing a green polo shirt. He is even smiling. Because of this he is barely recognizable, save for his head and facial structure.

In "Weirdmageddon 2: Escape From Reality," he is one of the people in Bill's throne.

In "Weirdmageddon 3: Take Back The Falls," he is seen being freed from Bill Cipher's throne and escapes with the all other residents afterwords.