"Diversity note: the first-billed actor is Elliot Page, and while it's very much an ensemble show he is always a little bit first among equals."

I only watched the first season and parts of the second, which may be playing a role here, but I really felt like the first among equals if it was anyone was first among equals it was Aidan Gallagher, both in terms of sheer acting and in terms of how much the story revolves around his character. Five is essentially the main way all the time travel happens, and who knows the rules of time travel. And Five, really, really gets a lot of the best lines.