Ink!Sans is the main protagonist of The Truce and Underverse, and the protector of all AUs alike. He originally made a truce with Error!Sans to never create another AU again, so that Error won't destroy his other AUs. Later on, he meets XGaster in X-Tale, and he gracefully shows him the multiverse. It is suspected that XGaster would later on give Ink his soul within a white vial. He later makes friends with Cross, who is devastated over the loss of his universe. Once Error!Sans takes his soul, however, Cross!Chara escapes to take Sans's souls without Ink's constant. The both of them, along with Underfell!Sans find their way to get Sans's soul united, but once that's solved, a new issue would challenge him and the AUs. Ink has a brown cape that wraps around his neck ( yup totally a cape totally not a scarf ) , a tan-colored shirt, a brown vest with straps, brown shorts, a jacket around his waists, his paintbrush, and finally a strap featuring all of his emotion vials, including the white vial XGaster told him to keep.