Everyone one except Jack.
I almost choked once when he showed up in one episode wearing a broad brimmed plantation hat, scarf, white bellbottoms & white patent leather shoes.
You were in on the scriptwriting sessions and can verify that Jack didn’t allow anyone to show personality? These guys were following lines written by writers on the mainland who didn’t even visit the set, and they did have directors telling them what to do. The director’s name comes in the credits at the beginning. If they were going to show personality, it had to be in the script in the first place. If it wasn’t that means they weren’t going to do it. Kono had some funny one-liners from time to time. It’s not as though he never got to joke around. This was a cop show, not a sitcom. This nonsense of accusing Jack of not allowing people to show personality, not have more screen time, etc. shows that people don’t know anything about how a TV show is made. One person, least of which an actor who plays the lead role, does not decide everything.
So what if Jack wore a white outfit, white bell bottoms, etc.? That outfit was out of place given that storyline, but that’s not a prime example of him showing personality. He wore that outfit to make the other cast members laugh.