W.D. Gaster is father of Papyrus and Sans, and Royal Scientist working to King Asgore. Alongside the King, he was one of the few who came first in contact with The Fragment.


Gaster is a tall skeleton, with two cracks on his skull, beginning from his eyes; Crack from his left eye extends upwards, while one from his right eye does so downwards. He also has purple eyes.

Gaster usually wears black labcoat and purple scarf.


Gaster is highly intelligent and hard-working scientist who is willing to do anything to fulfill his duty, be it destruction of the Fragment or releasing monsters from Underground. He also cares deeply about his sons.


Coming later! Would not want to spoil the story, now would I?

Abilities and Powers

  • Genius-level Intellect


Gaster is capable of using various different magic types in combat. He uses magic with his Hand Blasters, which change color depending magic he uses.

  • Green : Defensive Magic, usually used either healing or for barrier.
  • Blue : Gaster can use the Blue Magic to grab objects and souls and levitate them.
  • Yellow : Beams of Magic.
  • Orange : Gaster fires a small spheres of magic which then explode.
  • Red : Close-distance magic, where Hand Blasters form blades around them.
  • Purple : Gasters purple magic affects targets senses, making them unable to move expect in "+" Pattern - Only either to the sides or front and back.


  • Hand Blasters : While Sans can conjure Gaster Blasters, Gaster prefers to use smaller "Hand Blasters", replicas of his hands that can be used either to use different type of magic attacks or just grab things. They are more precise than Gaster Blasters.
  • Gaster Blaster : Gaster also has access to the Gaster Blasters when needed.



  • Unlike in most AU's, Patrol!Gaster never fell to the Core.