XGaster and Gaster.

Gaster is a skeleton and a geometry and chemistry teacher. Works with XGaster. He enjoys drinking strong black tea, loves reading, and occasionally likes to conduct experiments in the chemistry lab. He often patrols the hallway next to XGaster. He's a skeleton, like XGaster. His left eye has a thin black stripe running down the side, and his right eye has a similar thin, black stripe running up the side. He also wears glasses, but round ones. His irises are white, his pupils are black, and his eyeball is black. He wears a white sweater over a long black coat. His pants are dark gray. He also has one large hole in each of his arms. He wears a chemistry lab coat and silicone gloves over his coat. He is also serious, punctual, cold and does not show emotions, but is ready to support students if needed. Love to joke with XGaster.

In the past, everything was fine. He had a good wife and three sons. The oldest is Chara, he is a human like his mother, the middle son is called Cross and he is a skeleton like Gaster. Papyrus was the youngest in the family and he is also a skeleton. Later Gaster's wife died and he fell into depression for a while. He went from being a kind father to being strict, serious and cold. He started to treat his son Chara badly. Chara was 14 at the time. Unable to stand his character, Chara ran away. Later, to drown out the pain, he went to school to teach other students and teach them discipline and punctuality. Now he also has two son skeletons. Cross is now 12 years old. He is quiet, calm and kind. His eyeballs are black like Gaster's. The right iris is red and the left is white. The pupils are black. He likes to read books and from food he likes marmalade and chocolate and tacos. Papyrus is sociable, active and sweet. Papyrus is 10 years old. His eyeballs are also black. All two irises of the eye are white with black pupils. Papyrus loves cookies with milk and marshmallows. Chara had white hair and his eyes were red. By nature, he was decisive, argumentative and vindictive. After Chara escaped, Cross wears a yellow heart pendant around his neck that Chara left for him in memory of his older brother. In front of his father, he takes it off and puts it in his pocket.

XGaster is a skeleton and an Algebra and Physics teacher. He is 1.92 meters tall. He works at the school in the same room as another skeleton, a regular Gaster. He loves to drink strong black coffee and constantly write in a notebook. He doesn't like it when someone is late for his lessons or when they don't listen to him. Skeletal body. On the left side of the eye there is a black thin stripe down and on the right eye there is the same thin and black stripe on top. He wears a dark purple suit that almost reaches the floor and also wears glasses. Under his purple cloak, he wears a white sweater with a collar. His pants are also dark purple, and his shoes are also dark purple. He has black eye shells, white irises, and black pupils. In each of his skeletal palms, there is a p. XGaster and Gaster—two skeleton teachers who teach at the school. XGaster is the Physics and Algebra teacher, and Gaster is the Geometry and Chemistry teacher. Each palm has one large round hole. His iris is white, his pupils are black, and his eyeball is black. By nature, he is strict, serious, cold and irritable when people are late for his classes.