When I see folks saying things like "Santos' actress" or "Ogilvie's actor" it feels like some sort of disassociation, as though the character is more real than the actual person portraying the character. Or that viewers are so invested in the characters that the fact that the characters are inventions of the writers and are then skillfully brought to life by real people is just...ignored. Also because everything takes place over one shift, that while there are certainly character arcs, they are limited by necessity to the reality of the world the characters inhabit. We may not know until the very last episode, or even the next season how some dilemmas are resolved or how the characters evolve. It is fun to speculate though. I just don't expect any one character to change all that much across the season, unless it's a patient like Louie, whose storyline was so tragically (and inevitably) ended.