Papyrus (Undertale Rejuvenation: Classic)

Papyrus is the main Heroic Antagonist of Undertale Rejuvenation: Classic and its upcoming remake, Undertale Rejuvenation: Nihilism and is the younger brother of Sans. He assists his brother in fighting Frisk, albeit with no intention of killing them at first, only thanks to them rushing and Alphys injecting him with Determination.
== Personality ==
At first, Papyrus doesn't differ much from his Undertale counterpart's persona. That being said, flamboyant, childish and narcissistic, yet kind hearted and sweet. However, he shows a more brave and selfless side to him as he arrives to help Sans fight Frisk. He even wishes to not kill them even though they had already done so to him once.
However, once Frisk kills Sans, Papyrus is distraught and finds a new hatred for them. Despite this, he still believes that they can do better, yet he will resort to more drastic measures in doing so, like killing them for example. If they attempt to kill him the second time he spares them, Papyrus then realizes that Frisk is beyond saving and attacks at full force since everyone's lives are at stake.
== Relationships ==
=== Sans ===
In regular Undertale, Papyrus views Sans as a lazy slacker and very easily gets irritated with him, but still cares for him nonetheless. The relationship doesn't change much in Rejuvenation, other than Papyrus not seeing his brother as a total lazybones, as shown when he saw him fighting Frisk in the corridor, he wasn't surprised that he was fighting to begin with. He is also aware of his strong magic, as when he uses the Gaster Blasters and has a hard time aiming them, he mumbles to himself, "How did Sans use those things?" Papyrus may seem to have a hard time trusting Sans as well, such as when he gets angry for Sans' mad dash attempts to kill Frisk or when he does so if they spare the brothers, despite the latter showing no signs of remorse.
When Frisk kills Sans, Papyrus is horrified and cries as his brother turns to dust, falling to his knees and grieving as a result, showing how much he truly loves his brother.