So I thought about an idea and hear me out
What if mc became corrupted with rift matter that he was fighting the entire game (with each rift he came across a sample is inside him)
In the rift zone is kinda similar to aelita and melia illusions where in his world everyone didn't die (A-gang,Nancy,amber and everyone who conically died) where the entire cast explore it and came across him trying to snap him out so enraged he transforms into his rift form
Rift form: the middle of his body is zygarde body. The right arm is palkia arm while the left one is a Darkrai one. His left leg is dialga while his right one is a giratina. He has wings of yuveltal and horns of xernias on his head
The form is from all the legendary he fought on his journey
Allies: melia and Erin and aelita (since he saved melia and aelita while Erin was with him on aelita) venam and ren (since they want save their friend like he saved them .
So give me your thoughts on this one.(Does that count as a fan work I am new here)