From the Super Mario Wiki
Toopa Strikers are deadly versions of Koopa Striker enemies found in the Wii game Super Paper Mario; they are encountered in the Bitlands, in Chapter 3-1. They are a kind of Koopa Striker and as such, resemble Koopas with large brown eyebrows and a black and white checkered shell, although they can be told apart from the other species by their green-yellow clothes. They have the same stats as a Koopa Striker too, but they behave differently: pairs of Toopa Strikers will kick the shell back and forth between them to damage their foes. Their name is a reference to this teamwork, a pun on "two".
Toopa Strikers will also try to trick the player by kicking the shell upward and may kick the shell to make it encased in fire. They will also back away from the Mario, Luigi, Princess Peach, or Bowser when they are close to these characters. However if one partner is defeated, the other one attacks like a regular Koopa Striker but they still can kick the shell if it hits a wall or if Mario kicks the shell at them. They are the only striker that are absent in the Flipside Pit of 100 Trials, and Toopa Strikers are rare, with only 4 of these enemies appearing in the game. Their card tells them that they are uncommon, however.
Toopa Strikers all have the ablity Flip between dimensions.
Names in other languages