Spoilers !!!
I'll be going over each character separately
John Nolan: He was very in the middle for me. He has more to do earlier in the season like when it came to Bailey's drama Abt Jason and celinas plain clothes day. I was also expecting him to have a bit more of a play in nyla and James secrets between each other that they were keeping But other than that he didn't rlly have much else except maybe going undercover for the bomb bus and the finale which didn't feel like one. So rlly he was better support character than main character.
Tim Bradford: He seemed to be more comforting this season which might be due to Lucy rubbing off on him. But that last episode dragged out the relationship to long they should've talked this whole season. His training with miles was great it felt natural especially with the whole theme of sport between them.
Lucy Chen: I was expecting a lot more from her this season tbh with Seth but that felt a bit wasted when she became a TO but her now being Sargent only hints at what we see next from her. Other then that her dynamic with Celina was pretty fun and new. A lot different then Lopez and Harper .
Angela Lopez: She seemed to have taken a bigger back seat then Nolan which was a bit surprising. The most she rlly did was talk to Tim Abt Lucy and be in nylas corner Abt James and Liam the episode prior. Otherwise it was just malvado and maybe Tulsa at best which again I think she had a minor role.
Nyla Harper: She definitely took a spotlight mid season. Her development was great when she began helping James alot more with the gunshots. Her interactions with Liam tho were pretty crazy hinting towards his crimes. Also her role in the finale was pretty good especially with the drone kid.
Wade grey: He didn't rlly have to much to do except maybe the April fools prank and his interactions with miles. He could've had a bit more tbh.
Celina: She had many achievements from doing well in plain clothes to passing her rookie training to even going undercover. Her dynamic with Lucy , Rodger and even Miles was pretty fun and some of the challenges she'd have in solving crimes was either light hearted or very dark.
Bailey Nune: The most I felt like she had was malvado and maybe helping John and Celina here and there . There didn't feel like much else she did.
Miles Penn: Great new character. His backstory with AJ was pretty interesting I wasn't expecting it. Loved the dynamic with Tim and Lucy he seems to be a mix between them. He seemed to have great interactions with Seth and Celina too. But I'm waiting for him to have something more soon.
Seth Ridley: He deserved the same treatment as miles. I didn't understand the point of his lies . But him dating Tamara was a great idea but Im hoping he somehow comes back after he recovers from the amputation. There wasn't rlly redemption for his lies. The most he did was save Nolan and team up with miles for once that's was it and both were lucky/ unlucky.
Wesley evers: Didn't seem to do much I was hoping he has a bit more. The most he did was rep miles and help Angela and nyla here and there.
James Murray : I was hoping to see him a bit more towards the backend of the season but I loved the secrets he kept from nyla I was pretty shocked when he did. Also his new idea for the justice system was pretty cool.