INFO-DUMP

A canon boss rush… with its own plot, so-to-speak.

• The protagonists are Zexion Brady (male), Shara Uchiha (female), Gardevoir ("genderless" - its gender is never revealed, so it's more "ambiguous", really)
• Antagonists are Malice (female; ruler of Castle Oblivion and without a last name), Anubis (male), Shadow Gardevoir (again, ambiguous gender).

STORY:
Shortly after Serenity Horton's victory, a hero(ine) wakes up in an odd, stark white castle with none of their memories. A challenge is issued - either leave, or go through the castle to regain the memories.
BOSSES:
Bosses are sorted in the order they are battled. I may have missed something or someone, by the way. The returning ones are:

• Sycor (I), Ghost Dragon Sisters, Grialdyn, Bao i Ora mi Que, Irving, Kulala
• Micren, Sycor (II), Valkyrie X
• Azehrys "Azehr" Chan, Alexis Flamberge, Xyz, Shinica Horton & Lunadine "Luna" Crimstaine, Ataraxis, Shiori Shauntal
• Aidan Flamberge & Tranquility, Noxakaisink, Invidia & Nemesis, Cheriza, other bosses that might be added?

The new bosses that are confirmed in my mind?

• Hooded Figure (Malice, really): 250 HP, first boss
• Anubis: 4444 HP total (4 forms = 1111 HP each form)
• Malice: 1000 HP total (2 forms)
• Shadow Gardevoir: 345 HP

Possibly a bonus boss: Lavitka Nástenka Neumann.
Pre-Boss Fight Speech:

Welcome. You hear my thoughts, for I can speak only through telepathy. I am not from this world. My theme… "Shadow Smash". I control Ice, Fire, Psychic… my parents do not exist in this world, nor do they exist in this… multiverse. To you and miss Malice, I am real. To others… not so. To them, I am naught but an illusion. Born in 2015 on Christmas Day, sent from 2025 to a dimensional interstice in 2013… such is the reason I ended up here. Now… I am your opponent. En garde!

Her date of birth is 25 December 2015, and yes, Shane Neumann and Kim Tyranto don't exist in the Lunar Shadow Universe. (Or its multiverse.)
Defeated Speech:

Tch! You're a powerful opponent. I am… Lavitka Nástenka Neumann. The daughter of the creator of this world. No, not that one. The real creator. This very existence is by her hand… She resides within the real world, but alas! You appear to be unable to comprehend what I mean… but perhaps the others can understand. Spectators… they witnessed this event. They witnessed what happened on Tirahnys a while back - the ruination of that castle at miss Ilina and miss Serenity's hands. Even now, they are witnesses to this event! From a dimensional interstice I came, and so I must go. I have yet to see Asorniva's world, assuming I am permitted there. Miss Elyn Maureen le Roux… to meet her would be an honor. Fare thee well, and may we, one day, battle again, perhaps in another world…

The "real creator" of her being Kim Tyranto, since she is one of Kim's characters. Malice can be considered my daughter, metaphorically speaking. You guys understand.
Plus, this assumes that the project Ellen and Shane planned ("Interstice of Dimensions", was it?) actually happened. Though, why she breaks the fourth wall, who knows? Illusions, perhaps?
After Defeat Speech:

The ring that floats above my head is naught more than a chakram. A halo, it most certainly is not!

Duh.
Zexion Brady has never been ill in his life. Born in 1998, he is allergic to insect stings, alcohol, aspirin and broccoli (seriously). He trained for six years (starting 2002) in the Order of the Eagle, then for 4 years in the Order of the Lion,, and for 2 years after that, in the Hall of Swords. While kind to people who deserve it, his parents died in 2004 and his grandparents passed away a year after. He has steel-blue hair, blue-grey eyes and fair skin.
Shara Uchiha, born in 2001, has auburn hair, green eyes and fair skin. Her grandparents are deceased, and her mother is a maid. Her father divorced and is now living on the Cypher continent of Newerth. Allergic to fish and pollen, Shara had a chemical burn to her skin since 2007, hypothermia in 2006, frostbite in 2008, and suffered a chest wound and broken arm in the same year. She had a heart transplant in 2009.
The Gardevoir hatched in March 2005 as a Ralts, then evolved into Kirlia in June 2009, before evolving into Gardevoir during September 2014. Generally silent, and its ability is Synchronize. It has a fondness for Kuko Berries but dislikes Enigma Berries for its taste. It seeks to bring unending peace to Newerth, and has never been captured before (and isn't planning on changing that). It helps people who truly need it.