That's quite a few characters, especially considering that all we're basically going to be doing is a bit of interaction and then the Tenebrae conflict....

Fiery's characters are accepted as are Kho's.

Beta, Yukihiro's shikai is fine and most of his bankai is okay. I'd opt that he has to see a technique play out at least halfway for him to be able to flawlessly copy it. It'd be easier for him to copy melee type abilities/techniques, but it will be more difficult if he's trying to copy an ability from another race (hollow/arrancar or humans/fullbringers and quincy not to mention sinners) which will either decrease the effectivity of copied techniques even further, or make it nearly impossible depending on the technique.

Keep in mind that techniques you copy will be more strenuous on your character's soul due to the fact that you're trying to use something that is not bound to you and you're basically forcing yourself to change in order to compensate. The rest is fine I belief.

Make those edits/additions, or suggest others, and it'll be accepted :)