The blue Kirby represents Hakkun, a blue-colored blob character who features a spherical design and similar abilities.
The stage and music track represent the first stage of Sutte Hakkun, which takes place on an island and features a green meadow background.
The stage and music track represent the main setting of Super Mario World 2: Yoshi's Island, a two-dimensional platformer released on the NES along with Sutte Hakkun.
The Invisibility rule references how Hakkun will initially appear as transparent until he sucks up the colors from bottles and blocks.
The timed battle condition references the score point gauge in Sutte Hakkun, which rapidly depletes each time Hakkun performs an action.
Other trivia:
This spirit's Transformation Duration ↑ ability references how Hakuun can change colors after sucking up the colors of bottles and blocks before transferring the colors elsewhere.
