Alphys

The Underground's anxious royal scientist, who guides the human through Hotland.

Alphys is a reptilian monster in Undertale (2015) and Deltarune who serves as royal scientist to Asgore, the ruler of the Underground, researching how human souls could break the barrier. She is a fan of anime and manga, friends with the robot Mettaton and with Undyne, captain of the Royal Guard, who becomes her girlfriend in the True Pacifist route, and she lives with social anxiety and depression. She guides the human through Hotland. In the True Lab the player discovers her experiments injecting dying monsters with Determination, which fused their bodies into the Amalgamates.