This sprite walks along the ground, trying to stay in front of Mario no matter what. It stands upright when not walking, and fires energy balls from its mouth at random intervals. It cannot be stomped, but 5 fireballs or a thrown item will kill it.
The energy balls from the included graphics use colors 9, D, E, and F of palette C (the red sprite palette). They replace baseballs.
Check the ASM file for customization options. The graphics for this sprite hail from Zelda II Adventure of Link.