Nidoo is a black blob with white eyes (green in Kirby: Triple Deluxe). It can take on the appearance of several objects—these objects vary from game to game.
Nidoo disguises itself as a door, and when Kirby comes close enough, it shows its true form and then bounces around. Nidoos can be distinguished from real doors by looking at their shade of color; Nidoos are always lighter colored than a normal door. Nidoo grants no Copy Ability when inhaled.
|This section contains content derived from Japanese|
In Kirby: Triple Deluxe, Nidoo appears in certain haunted stages, such as Stage 4 of Lollipop Land and Stage 3 of Wild World. Nidoo's eye color is green in this game. Its behavior has changed since Kirby's Dream Land 3; it now tries to attack Kirby by slamming down on him when he tries to enter the door. A variant of Nidoo disguises itself as a large platform. It will disappear shortly after Kirby sets foot on it, often dropping the hero into a pit or spikes.
A few Nidoos disguise themselves as paintings with doors drawn on them. If Kirby tries to enter the door, the Nidoo will reveal itself and slam down on him.
Nidoo comes from 似 (ni), meaning "similar," and ドー (dō), which is "door" (ドア) without the R, thus "doo." The floor variant, Niloor, comes from "similar" and ロア (roa), which is "floor" (フロア) without the F, thus "loor."
- In Kirby: Triple Deluxe, Nidoo's snicker sound effect is copied from Sphere Doomer's snicker in Kirby's Return to Dream Land.