As the sixteen year old human, Daichi Kouseki is very quiet and reserved, and rarely speaks. But when she does she's very cynical and critical of everyone. As Sailor G, she's cold and merciless. As an Andromeda senshi, her name was Sailor Gaea, but she was captured during Selestia's invasion. Finding that just using initials was a heluva lot easier than saying their whole names, Selestia changed Sailor Gaea's name to Sailor G. And turning her evil made her a lot more bitter and committed than she was before. G's a strategist and the leader of the evil senshi. She's good friends with both, though Cassiopia gets on her nerves and they fight constantly, and she looks on Ai as a weakling.

The situation Sailor G found on Earth was quite amusing. She and her two friends, after stealing three galaxy beads from the Time Gate, travelled to Earth to find and kill the King and Queen. Only they found that the two rulers were trapped in the bodies of humans, and sailor senshi at that. No problem, of course, they'd just kill them as they planned. But the senshi were putting up quite a resistance, and soon they'd found out the evil senshi's identities. This wasn't going according to plan, and G was very dissatisfied. But it wasn't the end. Sailor G still had a few tricks up her sleeve... namely her ability to locate galaxy beads..

A few words from Sailor G:

"Sailor A, perhaps you should get off of her nice car."
"Fine, be that way."
"If anyone gets in our way, they should die!"
"We aren't fighting. We're completing a mission."
"Shut up, Hinkaku."
"For the last time, shut the Hell up!"
"Time to die."