|Full Name||Galaxy Mettaton Monstero|
|Also Known As|| GalaxyMettaton
|Status||Shot off Akademi High School Rooftop by Silly|
|Love Interest(s)||Mickey Mouse|
|First Appearance||Yandere High School - GANG LIFE! (Minecraft Roleplay) #57|
|Last Appearance||Yandere High School - SEASON FINALE! (Minecraft Roleplay) #80 (The End)|
Galaxy Mettaton Monstero was the leader of the Inagawa-kai division of the Yakuza. She was in charge of exporting Poker Cards and robbing money from others. She wasn't killed by Rowan Artifex during the Yakuza Attack on Buraza Town as after she won all that poker money she went on temporary vacation to Disneyland. She was later contacted by Yuki to kill Grian for the supposed revenge of the Yakuza Leader Karu. She was the last Yakuza to remain on the battlefield and was shot multiple times by Mrs. Okami Artist and the final blow was delivered by Silly. The impact of the bullet knocked her back several feet and she was killed by shock even before she reached the ground.
In her childhood, she was a member of the Yakuza Club. Often stealing things and scamming others for money. She was not necessarily friends with the boys, but still a major bad influence to the lot.