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Why do I get the feeling that the Worldline where Kingdom Hearts Union X is infact a realm that works opposite of the Realm of Light?
In the Realm of Light Heartless are formed from Darkness while in the Worldline of Union X the Heartless created from the Book of Prophecies drop Lux/Light and are supposedly made of Lux with the only Heartless actually made of Darkness being the ones made by a Nightmare Dream Eater.
If the Hearts that are removed from Hearts are turned into Light Heartless in that Worldline then all 6 Union Leaders left the Union X World and wound up in the Realm of Darkness stumbling upon a broken Daybreak Town that may or may not have been put atop the True Realm of Darkness’s Luxu(Libido/Cupido most likely since those are the other Latin words for Lust)'s throne by the Master of Masters.
The Realm of Light is a false one created by the Union Leaders and through them the Master of Masters corrupted the Realm of Darkness with Light to resolve the Keyblade War between the true Realms of Light and Darkness!
Strelitzia’s Nobody(i presume it’s her Nobody) wears a White Coat(which naturally wards off Light) because she is a Nobody in the True Realm of Light not a Nobody in the True Realm of Darkness.
Sora will probably meet Strelitzia’s Nobody after playing the Reaper’s Game and Luxord sends him to the True Realm of Light(filled with Light Heartless) due to Sora’s request to be sent to the Realm of Light due to poor wording of said request(since Sora doesn’t know his Realm of Light is fake).
I have strong suspicions that Foreteller Libido/Cupido assaulted the True Realm of Light at the same time Brain and his assistants wound up in the True Realm of Darkness since otherwise Scala ad Caelum wouldn’t exist if they were fighting Libido/Cupido at his throne.
Libido/Cupido is likely ruling a false Realm of Darkness built atop the True Realm of Light(which is probably burning in contrast to the True Realm of Darkness which is flooded) and wearing a more Demonic version of the Keyblade Armor Xehanort wore in KH3 and wielding the End of Pain Keyblade on top of that.
Edit: Recently noticed Posters on KH Insider suggesting that Darkness is a Time Traveling Lauriam who attacked his sister.
That gives me an interesting theory: The Master of Masters told Ava to give the Union Leader circled the Book of Prophecies in a way that no one would notice.
There are Fan theories that Darkness took the form of Brain to get the Master of Masters’ own Book of Prophecies so what if Lauriam split himself into his Nobody Marluxia and Heartless Darkness and Darkness went back in time with Ava/Skuld?
Ava after listening to Gula in the form of Skuld(to get more info on the Traitor of the Book of Prophecies) would arrange for Ventus to come to the house while Lauriam turned Strelitzia into a Heartless and Nobody then taking the form of Ava give him Strelitzia’s Book of Prophecies while Ava attempts to rescue Strelitzia’s crush AKA the Player Character.
Skuld then sends everyone to the Dark Worldline AKA the True Realm of Darkness in a replica of Daybreak Town’s Clocktower created from her Book of Prophecies and Lauriam’s Heartless grabs the Master of Masters’ Book of Prophecies as planned!
Then Lauriam’s Heartless rendezvous with Ava and takes the Book of Prophecies to the True Realm of Light and hides the Book somewhere.
Ava would take the form of Skuld then return to her own time AKA the Union X Era and Brain gets Luxu’s Keyblade and later passes Ava’s Book of Prophecies and Luxu’s Keyblade to his apprentice.
The 5 Union Leaders(Ava/Skuld, Ephemer, Marluxia, Darkness/Ventus and Brain) use the 5 remaining Arks/Lifeboats(one is damaged and Maleficent used another) to travel to the future where people who remember them would bring them all back.
Ephemer would give his Scarf to Luxu for this only for Luxu to forget about him since Luxu only had interest in the Virus/Lauriam’s Heartless and Ava/Skuld.
Luxu through memories of the Virus brings back Ventus and Darkness with him just as how the Fairies brought back Maleficent. Luxu also brings back Ava/Skuld in Radiant Garden as Subject X.
Elrena(entrusted with Luxu’s Keyblade and Brain’s Earring) gets killed somewhere down the line during the Dandelions’ conquest of the Worlds(passing her Keyblade down in the process) and ends up playing the Reaper’s Game with Demyx as her partner and Brain’s Earring as her fee and wins only for the Reaper to take her to the Realm of Light where her memories restores Lauriam.
Vanitas/Darkness and Marluxia’s demises naturally recompletes Lauriam only for Young Xehanort to rip his Heart out while he is unconscious recreating Vanitas(who now needs to recreate his Heart with Unversed) and Marluxia until Sora beats both of them restoring their original Memories.
Lauriam’s Heart is now intricately connected to Sora thanks to inhabiting Ventus and since he wishes to reunite with his Sister will use the Power of Waking to jump to Shibuya where Sora is with Elrena in tow and play the Reaper’s Game with Luxord to get back to his sister’s location.
Luxord’s Somebody will presumably grab Marluxia’s Scythe and Larxene’s Knives as their fee forcing Lauriam and Elrena to use their Keyblades to win the Reaper’s Game(which will presumably involve fighting Strelitzia’s Heartless and Nobody for added irony).