Basically in this story the Heroes give Izuku a mission, a mission that brands him a traitor but ultimately saves everyone. Now then Izuku's Sharingan in the right eye is the Kamui and in the left is Tsukuyomi and Kotoamatsukami now Izuku's quirks a...
(Just FYI Katsuki has better control over the Amaterasu and Akkorokamui and has extended the Akorokamuitime limit to about 10 minutes and has the Armored Stage of the Susanoo)
Izuku is currently mediating on a cliff edge when Katsuki shows up
Izuku: Have you made any progress Katsuki?
Izuku stands up and turns to Katsuki with his eyes closed
Katsuki: Oh yeah...
Izuku: Your going blind from over use of the Mangekyo Sharingan correct
Katsuki: I'm about 65% blind
Izuku: Well then this might be one of your last chances to fight me
Izuku opens his eyes with his Mangekyo Sharingan activated
Katsuki: Amaterasu...
Katsuki uses his Controld Amaterasu on Izuku but Izuku just Kamui's it away
Izuku: ...
Katsuki: Akkorokamui...
Katsuki's body starts glowing red his muscle mass increases and lightning starts coming off him
Izuku: About 10 Minutes right?
Katsuki: Yeah...
Izuku: You may have the raw Strength of the Perfect Susanoo while your using the Akkorokamui but you are still far from the true power of the Perfect Susanoo
Izuku's body starts radiating a gold aura and then his Perfect Susanoo appears
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Katsuki: Holy shit!
Izuku swings his sword at Katsuki but the advantage Katsuki has is speed so he easily dodges it but Izuku's swing from his sword still cuts the surrounding mountains in half
Izuku: Your faster I'll give you that... But you'll never hurt me
Katsuki: Wanna bet!?!
Katsuki's body starts radiating a red aura and then his Armored Susanoo appears
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Izuku: No wonder your almost blind you have the Armored Susanoo I said Skeleton Stage but this will at least provide more of a challenge
Katsuki: Definitely...
Katsuki ignites his Susanoo'sDrill combined with the Amaterasu
Katsuki: Chakra Needles!!
(Because I don't know the actual name of the attack)
Katsuki coats his Chakra Needles in Amaterasu but it does pretty much nothing against Izuku's Perfect Susanoo
Izuku: Is that the extent of your Armored Susanoo?
Katsuki: No even close!
Katsuki attempts to hit Izuku's with his Amaterasu coated Drill bit it shatters on Impact of Izuku's Perfect Susanoo
Izuku: There's a vast difference in power between the Armored Susanoo and the Perfect Susanoo
Katsuki: Damm it!
Katsuki stops using his Armored Susanoo and states relying on the Akkorokamui
Katsuki: Time for this I guess
Katsuki creates Shadows Clones and starts creating a Rasenshuriken
Izuku: A Rasenshuriken huh?
Katsuki coats the Rasenshuriken in the Amaterasu
Izuku: Oh? An Amaterasu Rasenshuriken...
Katsuki: Amaterasu Rasenshuriken!!
Katsuki throws the Amaterasu Rasenshuriken at Izuku but it does nothing to his Perfect Susanoo
Katsuki: GOD DAMNIT IT!!
Katsuki punches the ground repeatedly causing himself to bleed
Izuku stops using his Perfect Susanoo and walks up to Katsuki
Izuku: A word of advice Katsuki... Go to the graves of Sasuke Uchiha and Naruto Uzumaki
Katsuki: Why!?!
Izuku: You need to add they're DNA to your own
Katsuki: Why?
Izuku: So you can unlock the Rinnegan...
Katsuki looks up at Izuku
Katsuki: What's the Rinnegan?
Izuku: This
Izuku's Mangekyo Sharingan turns into his Rinnegan
Katsuki: Woah...
Izuku: The Rinnegan will give you new abilities along with allowing you to use your current base Mangekyo Sharingan abilities without causing Blindness at least as long as your using it and not the Mangekyo Sharingan... But be warned... It will take a while to develop the only reason it developed for me so fast is because of my Super Regeneration... It will definitely take longer for you... Till our next meeting Katsuki...
