Acchi is a red salamander or dragon-like creature greater in length than height. It has brown eyes, a tan underbelly, a small mouth, stubby arms, and two-toed feet. Flaps of skin resembling fangs hang on either side of its mouth. Acchi's back is constantly ablaze.
Acchi will sit in one spot, waiting for Kirby to approach. The enemy attacks by sneezing fireballs, which move in a arc. These burn on the ground for a few seconds before going out. Acchi can spit them upwards in a parabola or straight at Kirby.
Acchi's name is a pun on the Japanese word "acchī" (あっちい), which is often said when something is very hot, and is a diminutive of the word "atsui" (熱い/暑い/あつい meaning hot). It also derives from "achoo", the sound made when one sneezes.