From WiKirby, your independent source of Kirby knowledge.
Topper is an uncommon enemy from Kirby: Canvas Curse. It resembles a key chain link with an orange box with a face in the middle. The face in question somewhat resembles a common electrical socket. It hangs in-between walls, creating a field of static current that blocks off a passageway.
To defeat a Topper, the player can use the Nintendo DS stylus to tap the creature numerous times on its box-face part to dislodge it. Kirby can defeat it by attacking its central piece using a Copy Ability or a Dash Attack, but this can be risky, as Kirby has a good chance of missing and hitting the static instead.