Tinky Tank

 Tinky Tank  (ティンキータンク (Tinkītanku), Tinky tank) is one of the main antagonist of the Slendytubbies series.

Origin
He is the second phase of Tinky Winky that first appears in Slendytubbies II. He roams around the Main Land at night. In Slendytubbies III, He is indeed confirmed to be Tinky Winky's second form. In the campaign, when The Guardian encounters Tinky Winky, Tinky Winky ate an infected Tubby Custard, and transform into, well, Tinky Tank. He soon chased The Guardian into the Mountains or Cave.

As a Final Smash
He appears as Tinky Winky's Final Smash.

As a stage element
He also appears as a stage boss on Main Land. He uses his attacks from his Slendytubbies III appearance.

As a boss
He also also appears as a boss in Adventure Mode. He's basically the same as his stage element counterpart.

Trivia

 * He is the first Final Smash and stage element to be in an universe to be based on a fourth-party universe.