Gugu Onee-Chan

Gugu Onee-Chan is the grown-up form of Gugu Chan. She came into existence through an alternate ending to "The Mermaid Note Returns (4)" — when Serie's reversal magic turned WhatIf Chan and Kaa-Chan back to normal, Gugu unexpectedly stayed in her mature appearance. She soon discovered she can transform back and forth between her child and grown-up forms at will, and she loves it. Her personality is a blend of Nelliel Tu Odelschwanck's composed grace and Gugu Chan's playful goofball energy — noble and serene on the surface, but bursting with childlike warmth and genki enthusiasm underneath. She only gets truly serious when someone she cares about is threatened. She still also loves playing Arknights, she’s very sweet and cute, and she REALLY loves giving and receiving hugs. Is she related to Endministrator? Difficult to say.