Gigant is a character first appearing in Bust-A-Move 4. He is the robot security guard of a ruined castle on the planet Gothic.
The North American Dreamcast booklet describes him as this:
"He is a chief security guard at a once magnificent but now ruined castle on the planet Gothic. He continued to protect the castle despite the devastation around him. But one day, he fell under the seductive beauty of a rainbow bubble and for the first time felt the power to follow his own will: "I want that beautiful thing.""