G is a character first appearing in Bust-A-Move 4. He is a mysterious, old man who lives on the planet Ordeaux.
The North American Dreamcast booklet describes him as this:
"An old, mysterious man who lives on the planet Ordeaux. No one knows his real name, and everyone refers to him only as G. There's a rumor that he likes tea. Also, when he is sharp he is quite fearful...?"