While still having his default Sans!Classic personality, he also have a more energetic and goofball side. Despite his carefree, silly and fun loving nature, he could also be passive aggressive or straight up confrontational on very rare occasions In his earlier version, he seem to be unconcerned bout the happenings in his surroundings and just takes things as they go as seen in a comic where he just casually trots out the fact that he is glitched and sells Frozen rocks in Outertale.