For the most part the balance is good. There're a few characters that need some tweaks, and some that need some huge nerfs, but someone who says that obviously plays for the fighting and not the graphics, so I respected him for it.
Only nerfs I would give to Mitsu is reduced damage on 4B and A+B. Pyrrha, Omega, Algol need their recovery frames increased on a majority of their attacks, Viola needs recover frames increased, orb tracking nerfed, and orb to register as horizontal or vertical
Aeon needs crawl stance, Raph needs quick prep and A to step kill, prep K to kill step, and fixxed management so that his moves like 22B combos regularly.
Mitsu needs less damage, for sure. I do think PyrO has a few too many options, though AS/DNS is easily punished on block as far as I can see, so I'm not too fussed about that.
Pyrrha Omega does damage, REALLY powerful, but her moves like 66B... the range... the speed, it combos into itself... hits grounded, and as far as I can tell, safe. Pyrrha has 22K which is a STEP, a TC, SAFE, causes a stun you can combo with 236B.
Algol has broken hit boxxes, your options when fighting his is only forward, you step you can be 4AAB'd, he stops a lot of counter attacks with his bullet orb that causes a stun... you try to back dash he can catch you in his chair, theres a list that goes on and on...
Viola has MAXI DAMAGE... one thing I like to do with Viola is 6A then I press my A+B+K button, press B+K A+B+K B+K A+B+K 44A+B and do a nice big dirty combo. SUPER easy to do, tons of damage. Also got her mix ups, and her 3B launcher which goes into HUGE combos.
Not to mention that her orb only registers as a normal attack in I believe 1 instance? All other times, instead of registering as a vertical or a horizontal, it registers as a kick... which causes problems for characters who have auto evades and auto guard impacts for horizontals/verticals.