Glitchtale!Sans is the main deuteragonist which first appeared in Megalomaniac, He almost died until Frisk came sacrificing themselves for Sans, however, Gaster took the hit for both of them, eventually Sans met his end when fighting Bete Noire also known as "Betty"
His appearance is mostly the Same, Blue jacket, gray hoodie, black shorts with white stripes, however, when he absorbed Frisk's soul, his left eye appears and glows just like his right eye.
Sans is laid back, often sleeping on the job and taking breaks. His laziness is a combination of fatalism and apathy. But, after the end of Continue, he knew that this timeline won't get reset, at least not without a chance of getting erased. That gave him the motivation he needed to fight for what's right and defend his friends and loved ones more than anything. He was able to create his own determination, enough to give him strength sacrifice himself to save Asriel in Dust.
In the original game Undertale, he always wondered if his indolence stems from his knowledge that any progress he makes will be erased when the timeline resets. He also suggested that his knowledge could be "a poor excuse for being lazy." But, that's not the case in Glitchtale. Due to the glitches, Sans gained the ability to remember all the timelines since Megalomaniac.
Though Sans is usually agreeable, he becomes eerily serious at particular moments. For example, in Dust, after Frisk confessed that they were thinking about resetting. Sans became enraged and was about to harm them if Asriel didn't interfere. He is also observant, enjoys making bad puns, and hates making promises.
Sans' abilities are mostly the same, Karmic Retribution, Telekinesis, Bones, and has fast reflexes and so much more. When he absorbed Frisk's soul, he obtain these Abilities.
- RESET - This is the ability that Sans commonly use when he won the fight, and Absorbed Frisk's soul [ Because Frisk have that Ability. ]
- GASTER BLASTERMINATION - Shown in Undertale Animo app, there is an information about sans, he use this ability as a special attack, its the wall of gaster blasters, however, it was probably used once in 'Your Best Friend'