Alphys wears a white coat and a dark suit. She was seen to wear a white dress with purple ladybug spot dress on her date.
Her iris are black and white sclera but when she is under control by Gaster, her sclera turns black and her iris turns light violet and a cross.
She can copy or steal other universe/timeline's codes.
Alphys made her first appearance in the underverse series.
She is Gaster's assistant. She is created with the only purpose to compile all the data generated during the Timelines, as well as keep XGaster’s personal notes during and after the X-Event's development. Despite her working and always seeming to be XGaster's side, she never wanted what XGaster had done to her home and family. Always in the behind of XGaster she tried to stop him indirectly by many different ways, but eventually she was murdered and overwritten as a loyal and emotionless assistant.
XGaster had all his trust in her until he discovered she was part of Chara’s rebellion in the 4th Timeline. She is still able to think for herself, but she doesn’t want to get involved in trouble anymore and just obeys her creator. She can also be used by XGaster as a puppet, giving him the ability to see through her eyes.
Alphys makes an appearance when Gaster orders her to collect the remaining code of underfell.
She leaves a sheet and it starts absorbing the codes into it and ends with the mark of an "X".
- She can put any Universe or individual under quarantine and use them at will.
- All the information XGaster gives her is saved in the shape of paper sheets. These papers have the same mechanic as the LOAD/SAVE from the Original Universe. She’s the only one besides XGaster who can use these options after using the Overwrite button.
- She used to also forget about past timelines and memories cause of overwrites but her documents helps her to recognize them again and again.