Undertale

A short lean skeleton with black liquid coming from his eyes, stopping at his chin. He wears a white turtleneck, black trousers, and black shoes. His eyes are normally white but glow orange with white slits when he is serious. He has two orange gauntlets above elbow length, each with a black heart at the wrist. An orange heart with a smaller upside-down white heart inside is on his chest. He looks eerily similar to Sans.

Delta is serious and focused, often displaying a cocky attitude in battle. He is brave and determined, with a strong disdain for evil. He rarely jokes around and is known for his quick and precise combat skills. Unlike sans he doesn't make jokes, although in battle he makes jokes just to mock his opponent. He hugely despise Frisk and Chara completely aware of what they've done in the past timelines, but this doesn't mean he despise humanity as a whole. He doesn't want anyone to know he is the Sans from past timelines which were erased. He loves to hangout with Dust, although Dust used to be evil he doesn't mean considering dust realizes his guilt, He is comfortable enough to joke around Dust. Although he is mostly serious he can be pretty laid-back and chill.

Delta!Sans is a skeleton from past timelines where Frisk and Chara committed the genocide route in the underground. He prefers to be called Delta to avoid confusion with the current timeline Sans. Having absorbed the Bravery soul, he has become braver and more serious, contrasting with the original Sans's laid-back demeanor. He despises evil due to the trauma he faced in his past timelines, which were erased and replaced by the current timeline.