Shadow Sans???

"I carry the weight of my entire timeline on my shoulders, their vengeance burning through the darkness. I cannot let them down, my determination won't let me". Shadow sans to chara. Shadow Sans was made by Shadow Sans 64 and is a very skilled fighter.
== Origin ==
He originally lived in an alternate timeline of undertale where gaster decided to make some changes. He changed a rule in this timeline where when you die, you come back as a shadow of your former self (literally). Sans eventually died and was revived. No matter how many times chara tried to reset. They would keep coming back. Shadow sans made a deal with the other shadows, They would all merge into him, giving him all of their abilities and skills. He became there vengeance. He was able to handle the determination because all those monsters souls equal 1 human soul. He was able to resist the effects of a reset and remember the past. Chara kept growing in skill but this time, so did sans. There crazy number of battles and resets were to much for the At to handle and it collapsed into the void. Now with nothing left he didn't know if there was anything left to fight for. Gaster managed to survive and decided to also merge with sans which gave him his code manipulation and hacks. Shadow Sans was filled with hope but then his soul began to crumble. The destruction of his At was to much to bare and the soul could no longer keep itself together. He sat there with no emotion. He had no mission because his vengeance was complete. He had the minds of two scientists within him so he was easily able to figure out a way to break free. He travelled through the multiverse. He found out about many gods and how dangerous they are. Thanks to all of the monsters within him he became a skilled warrior and very smart. He knew that not all of them were bad but some of them were. He knew what his new found mission was. He wants to bring peace to the multiverse. The way to do this is by protecting it. He met with ink and they became good friends. He knows that ink keeps most of the peace but is also a threat so shadow sans keeps an eye on him. He watches the multiverse and makes sure that there are no collisions. He now simply watches and keeps a low profile.
== Design ==
He has black bones with glowing white sockets. He wears papyrus's bright white scarf. He also has a mage robe that he wears. 
== Alternate variations ==
This story is something that can happen in almost any Au because it is an At. Here are some of the names for them.
Shadowfell-underfell
Shadow Swap-underswap
Shadowshift-Storyshift
Outer Shadow-Outertale
== Associations ==
Ink(friend)-They have a shared interest in creation and protecting the multiverse
Error(enemy)- He hates error for not using his potential for good
Fatal error(Worst enemy)- He despises Fatal for his mindless murders and cruel nature
Shadow Error(ally)(non canon)-Shadow sans decided that error should be absorbed and so he was. He then recreated error in shadow form as his puppet
== Powers\Abilities ==
He trains to improve the abilities that he gained from everyone
Normal attacks- He has the basic sans based attacks but they are shadow versions so they have been amped
shadow magic- He can use this to absorb souls and create new beings and dimensions
Phase- He can make himself as dense as a ghost
Invisibility- He can turn himself invisible
Basic monster attacks- He has basic froggit and other small monster abilities which he never uses
Determination- Using determination is fine because he has a soul that is equal to that of a human soul
Boss attacks- All of the bosses in undertale's abilities are at his disposal including spears, tridents, fire, and so many more.
Au jump- Thanks to asriel being the god of hyperdeath he can travel through Au's.
== Forms ==
Ex- He never uses this form but he becomes faster and more agile
Neo- There is no use explaining this because its never going to be used
Undying- If he is killed this form activates giving him an advanced form of papyrus armor and his determination is amped
God of hyperdeath-He wears asriel's robes and can use all of asriel's powers
Angel of death- He gets the outfit that he wears and gets all of the angel powers
== Weaknesses ==
His power can sometimes be to much for his body to handle. He could also run out of energy.