This is a close approximation of Lololo and Lalala from the Kirby universe.
The sprite will wait until the player approaches and will start to walk. After it hits a wall, it will teleport to a preset position on the screen, much like the boss fight in Kirby games. When teleporting, it may spawn a block, which can be picked up and tossed at it to damage it.
The sprite does not end the level by itself.
Check the ASM files for customization options. Make to read the included readme for information on setting up the sprite.
Included is Sonniku's Passable Ledge with SFX block, which is used for the fight. Special thanks to idol for fixing the sprite's graphics, as the original came with no palette.