Here's my opinions on each character
Akira: He's still the fucking monster he is in VF5FS. JF Knee lets him juggle like crazy and sets up for big damage.
Alpha-152: She suffers the same fate Tengu did in DOA4: balanced to the point where she's pretty much a joke. She can't teleport except by countering and she has all of Kasumi's weaknesses but like 10x worse because half of her moveset whiffs and is super-easy to counter anyway.
Ayane: Pretty much the same as she was in 4. Very deadly if the player knows what they're doing.
Bass: Wow, they finally managed to make Bass not suck. Almost all of his moves got major buffs, and he does a shit-ton of damage now. Also, everyone else except grapplers losing their offensive holds is a major boon to Bass.
Bayman: Another character who I think got a huge improvement from 4. Bayman's throw combos are now easier, and his mixup game got buffed heavily.
Brad Wong: No longer bottom tier, now feels more similar to the way he was in 3.
Christie: Got the short end of the stick this time around. She's exactly the same as she was in 4 but some of her moves were inexplicably nerfed.
Eliot: If you thought he was good in 4, he's much better in 5. Still pretty solid.
Gen Fu: Same as he's been in every game.
Hayabusa: Pretty much the same as in 4 but with some of his options buffed.
Hayate: Pretty much the same as in 4. The only difference I noticed was that his Raijin throw has been removed and replaced with a new 3-part throw called Nakiryu.
Helena: Nerfed hard from her 4 incarnation, but still very good. A lot of her easy mixups are harder due to more recovery.
Hitomi: Feels the same, maybe buffed slightly.
Jann Lee: Still an extremely solid character. His Dragon Gunner throw now has a guaranteed followup with 66K so that's a treat.
Kasumi: Still beginner friendly. Even with counters nerfed it's still pretty easy to tell of the opponent is mashing out a combo with her.
Kokoro: Much improved from her original incarnation. Her main buff being that she now has a functional kimono outfit.
Lisa/La Mariposa: Seems a bit weaker than her original incarnation. Maybe a bit slower?
Leifang: Seems similar to her 4 incarnation.
Mila: Very beginner friendly and linear due to her small movelist.
Pai: Same as she is in FS - a beginner-friendly character who has infuriating mixup and damage potential.
Rig: Seems pretty beginner friendly. He forces you to respect his kicks and mixups.
Sarah: Same as she is in FS.
Tina: Buffed HEAVILY from 4. She now does as much damage as her father and then some. She's also a lot easier to use.
Zack: Seems the same as he is in 4.