Poison

Poison is a copy ability that debuted in Kirby: Planet Robobot, and so far, the said game is the only one thus far to introduce the aforementioned copy ability.

Kirby: Planet Robobot
Poison makes its debut in this game, and it can be obtained from either the Venog and Dakuga enemies, the mid-boss, Miasmoros, or the Inkling Boy, Inkling Girl, Ganondorf, Inkling Squid, Callie and Marie amiibos. Poison directly focuses on toxic smog and puddles to deal damage to nearby enemies. The ability hat dons a a skull-themed headband with poisonous fluids spewing out on the top. The rim of the headband is similar to that of a coral snake, that are very well-known for their toxic and rather dangerous venom. This ability is the polluted version of the Water ability, despite both abilities share similar attacks in terms of move-sets. Just like with the Water ability, all attacks can put out flame blocks. It also has a Final Cutter-esque attack called Poison Pummel-Toxic Swamp, which behaves similarly to Cutter's Final Cutter attack, which involves Kirby throwing a barrage of toxin-infused attacks, and slamming the enemy with a high AOE splash of poison.

Trivia

 * This ability was heavily inspired by the Water ability, considering it is the polluted version of said ability.
 * Poison is the only Copy Ability so far in the series to not appear in any future games outside of Kirby: Planet Robobot.
 * Doctor appears in Team Kirby Clash Deluxe, Super Kirby Clash and Kirby Battle Royale.
 * ESP appears in Kirby Star Allies, making it the 2nd time aside from Kirby: Planet Robobot to appear in another game.