Regarding the Cosmo memory getting Aeris's Fury brand from vanilla effect....
I like the idea of his LB granting party support, but honestly, I find current cosmo memory way too overpowered.
In vanilla, I viewed Aeris as the best character, because everyone could essentially become the same and have the exact same strengths, and what separates them is ultimately, Limit Breaks, and Aeris had the ability to give 2 LB's for 1 (and great gospel).
Now as it stands with Red XIII, I'm getting 9999 on all targets (damage on Carmine weapon) with Cosmo Memory, and 2 free Limit breaks, which are for me Omnislash and highwind/big brawl (cause I just got highwind).
This makes Red XIII's Level 4 Limit Break Objectively the strongest LB in NT, as it basically three for one, which makes his final LB god tier, no one else LB's can compete as it's worth is literally triple that of anyone else's.
I think the reason why Aeris limits were so crazily strong in normal is that they knew you couldn't take her to end game and to help immortalize her, they gave her incredible LB's.
So I really don't think their effects should have a place in NT. And I'd also like to add, Fury Brand was understandable on Aeris, even if it was overpowered. It did no damage, and she had no damage LB's so it made sense and fit in with her self-sacrifice character-arc. But it doesn't fit in with red XIII at all really.
I'd also like to point out that Aeris essentially Sacrificed her Limit for yours, making it two LB's for one. Red XIII's is not sacrificing his, he's just giving two extra on top of his, which makes it so much stronger than Fury Brand.
I like the idea of restoring some balance for Red XIII's limits, but this goes too far imo. As I've said before, I use all characters, and I find pretty equal worth in them all, and so far at least nothing massively elevates one character above them all without having some negatives, but this LB changes that. I'm now nerfing my party if I'm not using Red XIII due to Cosmo Memory alone.
Like I said I like the idea of his LB supporting, but I'd try it in another way. Maybe take on effect buffs for red xiii instead? Like maybe lucky pills effect, or maybe the vanillas effect of Big Guard? Lot of possibilities with buffs alone. If you do want to keep it with him filling other party members LB's, I'd at the least limit it to one party members instead of both. It's just too powerful as is imo.