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in this AU Gaster had been working on trying to find a way for the monsters to be stronger. He found a very complex way of infusing monsters with the power of human SOULs. The humans captured for this purpose were all ki\led and this started the war between monsters and humans. The monsters cam close to winning but they were still shut underground by the humans. Gaster disappeared during the middle of the war and when the monsters were sealed underground, Asgore appointed Alphys, Gaster's assistant, as the new Royal Scientist. Alphys immediatly went to work trying to find a way to break the barrier. Soon after Chara fell down and made friends with Asriel. Chara and Asriel became as close as brothers and when they were older they found a way to the surface. Chara got sick and Asriel rushed Chara home but just as he got Chara inside the barrier, he was shot. Asriel seemed to have been ki\led and Chara got home and broke the news to Toriel and Asgore. Chara got better and when the next 6 humans fell down, the monsters ki\led them to gather souls to break the barrier. When Frisk fell down, Chara met them at the site of the fall and Frisk convinced Chara to help them kil\ all the monsters. They corrupted Chara and then went on to kil\ every monster. Sans was seen during all this as he was trying to find his dad, Gaster. When Sans got back and went to Asgore he found them all dead, even Flowey. At this point a portal opened and out fell Gaster, free from the void at last. Sans embraced Gaster and told Gaster how the 2 humans ki\led everyone and how they were the last monsters left. Gaster told his son that there was no need to worry and that he, Sans, could make the humans reset the timeline. Sans asked how and Gaster told him: "By the power of DETERMINATION". Then Gaster infused his son with the power of the DETERMINATION SOUL and then they went to face the humans. The battle raged on for some time and Sans kept fighting, taking no breaks, DETERMINED to defeat the humans. Gaster assisted Sans when it looked like the humans might overcome him and they defeated the humans, breaking their respawn points so they would have to QUIT and reset to a pacifist route. When this happened Sans and Gaster were unaffected and Sans kept the power of the DETERMINATION SOUL and Gaster never went to the void. Therefore Sans helped Gaster in secret so Gaster could hide easier and make sure things didn't get too messed up.
Sans is the determined skeleton. his brother is Papyrus. He has the ability to reset timelines and the ability to OVERWRITE and go into the code of any AU, the last 2 given to him by XGaster. He helps his dad, Gaster, in secret so no one finds out Gaster is still alive. And he is also Asgore's right hand man and the head of the Royal Guard.
Papyrus is the younger brother of Sans. Papyrus does what his brother Sans tells him to do, but he will make his own decisions when Sans isn't around. Papyrus has the power of the KINDNESS SOUL.
Undyne has the power of the JUSTICE SOUL. When she becomes Undying she gains some DETERMINATION. Undyne is the commander of the Royal Guard with Sans as the head. She also has a crush on Alphys, the royal scientist.
Has the PERSERVERANCE trait.
Asgore has the KINDNESS trait.
Toriel has the KINDNESS trait.
No soul trait
Gaster has no soul trait as he created the experiment.
Mettaton has the INTEGRITY SOUL. He gains PERSEVERANCE, JUSTICE and DETERMINATION in NEO form.
Napstablook has the KINDNESS trait.
Has the DETERMINATION trait.
Frisk: Frisk is the latest human to fall. They have the DETERMINATION and HATE traits. Frisk is also known as Ruined.
Chara is the first human to fall. Their adopted family is Toriel(Adopted mum), Asgore(Adopted dad) and Asriel(Adopted brother). Chara nearly dies but survives and when the next partial DETERMINED human falls Chara is corrupted to do genocide then everything changes back and in the Pacifist/Neutral route they try and fight Frisk/Ruined to show them that Mercy is the better option instead of fighting. Chara's soul is a combination of DETERMINATION and KINDNESS.
Has the INTEGRITY trait.