Digi-Koopa

The digi-Koopa is a Koopa Troopa that appears in Mario & Luigi: Bowser's Inside Story during the battle with Bowser Memory ML. It appears as one of Bowser Memory M's attacks. It looks like a generic Koopa Troopa but is square shaped and pixelated. When Bowser Memory M finishes his Super Mushroom attack, a digi-Koopa arrives and bites Bowser Memory M, shrinking him in the process. It reappears in the Bowser Memory MLX fight in The Gauntlet, retaining the same actions as normal. The digi-Koopa does not appear in the remake, mimicking the usual temporary effect of a Mega Mushroom.

Trivia

 * This attack is very similar to how a Koopa Troopa hurts Super Mario when he makes contact with it in the recurring games.