Gaster

his voice is different everywhere and nowhere, deep in the minds

observant. infinitely intelligent. manipulative. extremely fond of research. hates gays and transgenders and believes that "die is gay". considers everything as his experiment (for example, being with someone: "experiment number 372: subject showed... high survival rate in extremely dangerous living conditions, but it is time to end this experiment..."). he is indifferent to everyone and the problems of others. he doesn't give a damn about the problems of monsters that they want to destroy the barrier and go free (although when he was alive earlier, he diligently tried to find a way to destroy the barrier), he is only interested in his experiments and research of other multiverses... except for his son...

They used to be a humanoid monster with pale skin, but now only their head resembles a humanoid monster and also with cracks above the right eye and below the left. Their body is a blob of darkness. They are gooey but not sticky. his body is covered in a black lab coat that looks like both a business suit and a large dark lab coat at the same time, made of darkness. Fourteen levitating hands levitate around him

Gaster is not supposed to be able to exist, yet they still do.

Gaster possesses immense power, manipulating spatial and temporal anomalies. His existence is tied to disruptions in the very fabric of reality. He is also capable of manipulating gravity and creating devastating energy attacks. he can also call his "gray" minions, who served and serve to this day. he can also use his levitating hands, destroy something with them, release errors from his hands or even rays, or simply hit or grab someone with them

Gaster is a monster. More specifically, a humanoid monster, though their form has changed from being scattered across time and space.

They used to be a royal scientist. He created the Core, the main source of energy for the entire Dungeon. An accident caused him to fall into his own creation, causing him to disappear from reality, leaving only scattered references. They are not supposed to exist

Dr. WD Gaster, though they prefer to be called Gaster or Dr. Gaster.