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A short add on to this, but because of both Splinter's fighting, the turtles promised each other that there would be as much open communication between them as possible. They didn't want to hate each other when they grew up like their father's/uncle's.
(This has been sitting in my drafts for months rip-)
Since all the turtles and even the Splinters and Aprils grew up in a very different environment, they would obviously act a little different. So here’s my ideas on how.
Mutant Mashup AU by me and @sillyandquest
Oldest to youngest (as said here) DaVinci -> Red -> Sanzio -> Niccolo -> Purple -> Blue -> Simoni -> Orange
Both DaVinci and Red were the protectors. However, DaVinci was more offensive and Red as was more defensive. This was because Red had to worry about accidentally hurting people due to his strength and was pretty intimidating as is, but DaVinci didn’t. So DaVinci is slightly more trigger happy and Red looks for more peaceful situations. It’s not a major change, but if they meet their canon counterparts they’d quickly release the differences. This ties into Red’s mystic abilities too, as his holograms are more shield focused then in canon. Niccolo and Orange and holding their entire families together. As said here, Niccolo would help calm his siblings and cousins down when the Splinters fought, and Orange already had a complex about this in canon. Neither of them would be able to do this on their own (with how big their family is now) so they work together to keep everyone happy (even if they aren’t).
I’ve noticed the 2012 boys are big on teasing each other while the Rise boys are a lot softer to each other (minus Blue and Purple). So I’d imagine in this dynamic they’d both be in the middle ground of their canon dynamics. The Rise boys tease each other a lot more but are still softer then canon 2012, but the 2012 are softer to each other but still tease each other more then canon Rise.
Blue and Simoni and “the face team.” Which mean Blue taught Simoni some manipulation tactics. Simoni still gets tricked by 2012 Chris Bradford, but that was because he was star-struck. He’s actually a lot better at people then in canon. Also, Blue is a lot more insecure about himself because he doesn’t have his “face man” thing to himself and feels he has even less worth :(
Sanzio is slightly better at controlling his anger because Red is teaching him some things, though he’s still angry all the time. Also, he’s a little bit nicer to his little bros because they released that there’s 5 of them and one of him.
Purple also has more self worth issues then in canon because in there, he based his identity off being “the tech guy.” But here, there’s someone else that can do tech. Also, he usually gets put in the “safer” places during missions because Yoshi was overprotective of him because of his soft-shell, and all the 2012 boys (and even the Rise fam to an extent) followed. I could imagine an episode plot where he snapped and goes off to do something really dangerous to prove himself. Maybe going with the other brothers who get babied (Simoni and Orange)
Orange canonically does ballet (see the lair games ep) so I feel like I’m this AU Sanzio would be the kind of sibling/cousin-who’s-basically-a-sibling who would absolutely pummel anyone who bullies his siblings. Also I can see Orange and Simoni both doing ballet so when Simoni starts using his strings he moves around on them in a sort of “dance-y” way.
Since Lou let them sneak off to the surface before Yoshi was ready to let them go, I’d imagine DaVinci has an absolutely unreal amount of “Space Heroes” merch.
Since Simoni can be repelled by Poka, I can imagine Purple has an entire library of “Music genres my siblings/cousins-who-are-basically-siblings don’t like.” The labs were filled with Poka after Simoni activated his mystic powers