@Thinslayer Its hella good

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Oh boy, you should not have let me contribute I am gonna throw so much fanservicey shit out here. Feel free to take whatevers actually usable.
So we know Gwyndolin survives DS1 no matter what the chosen undead does, maybe he eggs on the cult? Also, Yorksha's Dark Moon Knights could be a thing, since we know it was an actual knighthood pre-DS3.
Corvians should totally be a thing, though given all we really know about them is a connection to the Painted worlds, I have no idea how they would integrate at all. Maybe the Chosen Undead entering the painting sort of 'unlocked' it and the Corvians from there could go back to Anor Londo? Maybe Priscilla too, since Gwyndolin is clearly much better about halfbreeds than his dad.
Ornstein also survived DS1 and journeyed a while before finally finding Archdragon Peak. Maybe him leaving his post caused a power vacuum or something?
Maybe the start of the wolf blood cult that would become the Undead Legion of Farron? Or the backstory of the women who would go to found the Sable Church of Londor could be part of the plot? Also we know that by the time of DS3 (and probably even DS2) very few demons remain. Maybe there was some kind of genocide? Also, Rosaria was most likely a god and was probably born by post DS1 so she could show up, pre-corruption.
<Snipped quote by Dark Cloud>
*Dodges another strike from Aizen, who has turned his attention upon me fully, which allows Ichigo to get a strike in on his right shoulder. He leaps away as I land and Ichigo gives chase, allowing me a chance to address you*
Because I'm a man of my word. I have a promise to keep to the one who gave me my power, and I do not intend to fail them.
<Snipped quote by Dark Cloud>
*Rolls my shoulders and charges forward once again, slashing across Aizen's chest as his sword clashes with Ichigo's, before being sent flying away by a backhanded slap*
Gah!
*Rights myself just fast enough to propel myself back towards the fight by launching off of a nearby wall*
<Snipped quote by Threads of Fate>
*Grunts before executing a half-turn to launch a barrage of cobalt colored Ceros back at Aizen, who dodges before ramming the pommel of his sword into my chest. Gasping, I find myself flying backwards into the nearest building, the ceiling of which collapses in on me*
Bastard...
*I push the rubble aside, having hardened my skin at the very last second, and get to my feet*
<Snipped quote by ZAVAZggg>
No, see, about that. You're... well, I'll let you figure it out. Maybe. Good luck!
[ . . . M e a n w h i l e E l s e w h e r e . . .]
<Snipped quote by Dynamics>
*Half an hour passed...*
*I look at the empty battlefield, breathing a deep hissing sigh as I fold my arms.*
Did they retreat Dynamo? I grow impatient...I must rip them asunder and destroy their very being...But if the cowards ran, where did they hide?