Let's start with weeping!dust: his attacks will be completely random even if u die they will be completely different and for his lore ima just say part of it after the player(frisk) killed sans 10009 times and sans had to kill his brother and his friends 10009 times just like the original dust sans he is insane but he's completely insane and broken he completely lost himself(still working out the full lore for weeping dust) and in his first phase he doesn't smile 2nd he starts to smile and his attacks starts to speed up and the music gets more intense and tears starts to form around his last phases but in the end he breaks down in tears he kills frisk but in the end he still dies cause out of soo much guilt and sadness he kills himself but that's not the true ending that's the cannon ending but there's multiple endings depending how u play the game and the true ending is you decide not to kill sans and he forgives you then u reset (BTW papyrus isn't the only phantom character all of sans friends that he killed all of them are phantoms and yes the phantoms can attack) now for Armageddon and anti killer sans:Armageddon born from the void and born from broken code he takes the form of chara(he can age so his past self his a minor or aka his current design his future self is a adult and yes I know there's already a destruction sans oc aka error but meh also he doesn't destroy aus he destroys timelines and divine guardian frisk or dg frisk he protects timelines my other undertale oc) Armageddon can erase multiple timelines with just a press of a button he can summon slashes without his knife he haves a scythe he can leave anti killers body anytime he wants(thanks to the deal him and anti made im still thinking for the lore of anti!killer sans also his nickname is anti!hero sans) anti killer sans only has a small amount of Armageddons power Armageddons power is infinite but he chooses to limit himselfnot to make things more fun to make things more interesting for him(part of his personality is inspired by lord x he still haves his own personality) he can also summon spikes aswell and other things