Mai is Emperor Pilaf's female half-wit follower. She always works with Shu and although she's quite intelligent (even more so in FUNimation's dub), the two of them always manage to screw stuff up. She's a beautiful, calculating enemy who always resorts to weaponry and high-tech.
At the beginning of Dragon Ball GT, we see an aged Mai that is still under Emperor Pilaf's command.
an extended description!