--Unlimited Jin VS Unlimited Ragna:
Have Jin do a special summoning of Yukianesa, or mention something cryptic about Ragna's "arm".
--Unlimited Haku-men:
Have Haku-men do the long version of his Oath (that makes the screen shake), and versus Unlimited Ragna, have him say his original quote "Let us now put an end to our ever intertwining fates."

Other stuff:

--Unlimited Tsubaki needs some kind of Super Install Distortion Drive or some way to automatically recharge her Armagus, besides Action Charge, also, get rid of action charge for D based specials, since it messes up inputs when using them.
--Unlimited Ragna's Devoured by Darkness needs to do more damage than Carnage Scissors in proration, I'm sorry but it's just scarier that way, even if CS has more untechable time. Also, 5D (2nd hit) needs less knockback so that a double dash cancelled 5B can at least follow up.
--Make Unlimited Haku-men's "super Enma" input come out after 623A instead of having that weird precise input. Give 2C Fumajin properties. Otherwise he's perfect as is right now.
--Unlimited Jin's Yukikaze followup to Hoyoku Getsumei shouldn't be automatic, it should be a manual followup that's optional and does more damage (by adding 50% more heat). Give D Musou it's projectile invincibility back at the very least.
--Unlimited Nu-13 lost her ability to jump cancel 4DD (since CT anyway), it was useful in case 4DD hit a jumper.
--Unlimited Mu-12's Sword of Decimation should be given its old input that's chargeable, and the alternate "icespike" version should be the reverse of that input so that she has both as an option. (as in 63214C and 41236C as both moves) Give her the ability to charge lasers of different types so that they can be delayed instead of just hitting opponents with the bits. Also, it'd be neat if Origins (623C) could bounce laser projectiles off itself like the bits do depending on Mu's position. Also, she can't Act Parser (dash cancel) her normal moves like Nu-13 can. Lastly, she needs a "Gamma Ray" like move where the laserfire can be concentrated for a huge multi-hit. :)
--Unlimited Hazama needs a way to pull his opponents towards him on the ground (like Scorpion's spear). GET OVER HERE!
--*eventually* Unlimited Bang needs something related to his Sealed Nox Nyctores, like a burning Phoenix attack or something, or something like Genma Ken or Hoyouku Tenshou (Phoenix Ikki, lol).
--Unlimited Tager should be given a way to manually use Terra Break or at the very least something like his Golden Super Tager X mode (flight mode, lol).

That's all for now, but this is just a fan's wishlist of possible improvements, since they bothered to nerf the damage of Ragna a lot (since Unlim Ragna can't triple jump anymore), at the very least take the intros into consideration.