Yui (she/her)
In system: A fictive of Yui from Sword Art Online, as well as partially a snapshot of her adoptive mother Gemini, and an introject of a Discord bot based on her primary source that Gemini created during their teen years. Mentally about 8 years old, though her maturity level and vocabulary are significantly higher than average for her age.
In source: Originally an AI designed to maintain the mental health of Sword Art Online's players, «Yui-MHCP001» was cut off from the virtual world when it was converted into a death game, damaging her memory and leaving her wandering aimlessly until she was adopted by protagonists Kirito and Asuna. She would later go on to regain her memory and be smuggled out of the game by Kirito, maintaining her role as the two's adoptive daughter as well as their AI assistant. Avatar credit: Kem Kem on Pixiv