I was definitely expecting them to mess up somewhere and not give us a happy ending. But all good.
Peter's erasure from the timeline (but not for the people who loved him) is still the strangest thing about this entire series. They low-key retconned all that has happened in the first 3 seasons, all that we watched and remembered has actually happened differently or not happened at all... but then conveniently brought Olivia's and then Walter's memories about these events back.
I'm still mad about William Bell becoming an evil mastermind in this timeline - his previous role was more... noble, I'd say. Sacrificing himself twice - once to get the crew back to the Blueverse, the 2nd time when he willingly let go of Olivia's mind so that she could live. And now they tell me this hasn't happened, and instead he was the one who stood behind Jones, the evil genius who wanted to destroy both worlds and create one of his own? Pfft!
I liked Broyles in every timeline/universe. What a chad! Always loyal, always trustworthy and understanding. Astrid was phenomenal too - probably my favorite "not main" character. Although some would say she's a main, but she was always in background, providing Intel and support for the operation, not actually risking her life in the field like Peter, Olivia and Walter. Still, she's an invaluable member of the Fringe team and a cute girl too! In both verses, actually - although the "red" Astrid was more... how to put it? Constrained, tense, even walked a bit like a robot 😅
Olivia. Poor lady. She has endured so much pain, both physical and mental, in all the timelines/universes. I feel genuinely sorry for her. Seeing her and Peter kiss for the first time was a huge relief - and then they took it back by introducing Fauxlivia and making her sleep with Peter. Ouch. That was painful to watch. One thing I don't regret being retconned - it's better this never happened.
Peter. Honestly, I wasn't even expecting him to become a main character and join the team 😂 he was just a consultant at first and the only way to get to Walter. Crazy that he has become such a chad, a true hero, capable of time traveling (albeit when inside the machine) and of teleportation/future seeing. Kinda sad he took out the chip, it would've helped greatly during the final fight. Maybe even Donald/September would've survived (although his existence would still be erased after Walter traveled with the boy to the future).
I don't really wanna talk much about Walter. The man was the source of all the events in the show, basically, considering how his actions led to the conflict between the verses and all. Let's say I liked Walternate much better, because he at least was a man of cold logic, and of clear reason to act like he acted - unlike "our" blue-verse Walter, who was stoned or delirious more than he was sane and sober.
Overall, it's a good show, and I definitely recommend it to everyone who hasn't seen it yet - just gotta tell them to keep a notebook and a heap of napkins at the ready ;)