Blue magic: Manipulation of the physical body's motion through soul control. Limited effect on inanimate objects. (Telekinesis)
Bone Manipulation: The ability to conjure and control bones in various sizes and shapes. Speed is controllable by the user and can be further increased through blue magic.
Gaster Blaster: An animal skull-like bone construct able to shoot beams. Size, charge time, and strength are controllable by the user.
Soul Trait Manipulation: The ability to change someone's soul to either Blue or Orange. Blue negates free movement, forcing you to stay on the ground or jump. Orange forces you to be constantly moving, or you start taking DOT damage. Both cannot be used at the same time.
Shortcuts: The user is able to take shortcuts through space. The more concealed the user is while doing it, the less energy-intensive it is.
Karma: Able to punish any sentient creature (aware of their actions) through what acts as DOT poison damage based on the sins they have caused. The more sins you have committed and the greater their severity, the more the damage increases.
Check: Able to check the name, LVL, LOVE, current mood, ATK, and DEF of a person or object.
Battle Box: Due to his monster trait, he is able to put a human(s) into a battle box when initiating a FIGHT with them.
Blinks: Allows Sans to skip the startup of any move he has, allowing him to catch the person off guard. When using this move, everyone within its radius will experience a momentary "Blink" effect, even if they normally cannot blink by themselves.
Btw, if you don't know Undertale (how), Blue is Stop and Orange is Go.
He will be classified as a Case 53 due to him being a skeleton. He has no connection to Cauldron. Also, his exact appearance in the world will be a blind spot. So all thinkers could get on him would be that he just appeared randomly.