X!Gaster

His fear is mirrors, he is panicky afraid of them, afraid that he will see in them a monster who has rewritten reality again, but at what cost?

XGaster can travel between different Undertale universes and send others there. Creation and management of substances: Within his universe, he can alter reality, including manipulating the substance from which amalgamates are made and creating new beings from it. Working with creature code: XGaster can view the code of other creatures, identify their weaknesses, and even recreate them if they have been destroyed. Cloak Formation: His cloak is not just a piece of clothing, but a part of his body that he can turn into a weapon.

X-Gaster possesses supernatural abilities such as reality manipulation through the OVERWRITE power, allowing him to create and destroy universes, teleportation across different multiverses, telekinesis, an infinite Gaster Blaster, soul manipulation, and immortality. He also uses his eight arms as weapons and can transform his cape into a weapon, control it as part of his body, and split himself into a tangible and intangible form.

XGaster, a skeleton monster, about 38 years old, 213 cm tall, dressed in a black, purple-violet tint, dark gray pants and black men's shoes. There are scars on his eyes that go up and down his face, his palms are pierced through, and in the middle of the piercing, there are like cracks in the shape of an "X" pattern, sometimes he can be seen reading a book with glasses.