Aggregate!Sans
Kinda a reff sheet.
The other form is a shape he can take due to an experiment gone wrong (kinda merging with all other Sans's and gaining pieces of their memories after a failed experiment with void goop, liquid determination, and save/load crystal things.). It's easier to see in the dark, the harsher the shadow the easier it is to notice. He can also just look that way if he wanted. It takes energy to fight his appearance shifting in the shadows so he doesn't always hide it.
The holes on his back are because he can have wings if he wanted, he can shift his body to look like any other sans so he can easily shape shift wings for himself. He will always have the shadow thing happen no matter his form and his halo like symbol along with the symbol on his eye will remain no matter the form. He will never be as strong as who he shifts into either since it can at times be a battle to stay himself when he does so. If he stays another shape for too long or uses too much magic he turns to the goopy form of himself only goopier and has to stay in the shadows to recuperate.
The glass either has tomato wine or cherry rum in it.









