The Butterfly is a recurring character in the Kirby series. Since Kirby's Return to Dream Land, the butterfly is often seen in opening or ending cutscenes of the main games of the series. The Butterfly became a way more important in Kirby Star Allies where it fuses with Galacta Knight to form Morpho Knight. Morpho Knight's description says that the Butterfly is seen as a "pure being".
The Butterfly is recognisable to its red, orange, yellow, and white colored wings.
Kirby's Return to Dream Land
The Butterfly is first seen in the opening cutscene of Kirby's Return to Dream Land, where it can be seen on a flower next to Meta Knight. In the ending cutscene, he is the one to awake Kirby by landing on his stomach.
Kirby: Triple Deluxe
In Kirby: Triple Deluxe, he can be seen flying by Kirby as he is yawning before landing on his head. It flies by again as Kirby is sleeping after having eaten several apples.
Kirby: Planet Robobot
In Kirby: Planet Robobot, the Butterfly is seen in the ending, where he is flying near Kirby before landing on his forehead.
Kirby Star Allies
The Butterfly is seen in the opening cutscene, where it is seen flying by Whispy Woods. In the Guest Star ???? Star Allies Go! mode, the Butterfly descends upon the recently summoned Galacta Knight and merges with him to become Morpho Knight.