Kurol is a character first appearing in Bust-A-Move 4. She is a baby inhabitant of the planet Grrrrmm.
The North American Dreamcast booklet describes her as this:
"She is a baby from the Grrrrmm planet where people are always costume-clad. She is a laid-back character who loves to sunbathe and take naps. Her journey will be in search of the "morning" and the afternoon "Siesta." Both of which remain missing."
Kurol appears as a blonde haired baby with black eyes. She wears a stereotypical frog costume with its "mouth" serving as the "helmet"...but otherwise, without her costume, she wears a standard baby diaper.