Well, last entry was years ago, but in case somebody reads this:
I agree that Peter is ISTP (ENTP? That dude? Outside of debating clubs and trolling ENTPs aren't really confontational people. They kind of crave for harmony (yeah, generalization, i know). There seem to be a real bias when it comes to intelligent STPs.
And Walter is clearly an NTP and NOT an NTJ. His Ti is very ovious, also his Ne. The question which one he is is more difficult, but I tend more to ENTP. Having Si as a last function and not Fe is way more plausible for me. He cares about other people, but has difficulties with structure and the rules of society. What typehe was before he butchered his brain? We probaly never know, but he made remarks regarding Walternate that suggest he was way more like him before that than we would think. He kinda sad that he was more focused, but not in a good way. He was afraid of what he might become. Ironically I think that if he was an NTJ before the procedure he probaly was an INTJ. He seems more focused on Intuition than on Thinking.
Before i type Walternate and since i refer to her: Nina Sharp is an ENTJ. If you typed anything else then NTJ: stop typing. If you typed INTJ: Yeah although the internet thinks so not every brilliant and / or interesting person is INTJ. And older extroverts often don't look that extroverted. Judge by the funtions. Nina clearly favors Te over Ni. EXTJs are probaly the most "introverted" Es, especially compared to EXFXs.
Walternate is ENTJ. I somewhere read INTJ (also when it comes to Nina Sharp) but that is just a proof that the internet has a very weird bias when it comes to INTJ and doesn't understand that EXTX (especially the Te-Doms) are often not that extroverted when it comes to interacting with people. You have to judge by the functions and both Nina Sharp and Walternate clearly prefer Te over Ni. Nina is a good example for a healthy, kind of balanced ENTJ and Walternate is clearly an example for the good-guy-gone-wrong ENTJ archetype. Okay, not really "good guy" but you know what I mean. I am not defending Walternate but I understand the reasons that he had. And his inferior fi is quite obvious. He is traumatised that his son was taken from him and bad at dealing with him.
Olivia: Very hard. My gut feeling was INFJ but i really don't see a lot of Ni in her. Maybe ISFJ? Rember, studies showed that mbti isn't absolute. There are people which have one or more function in the other variant as their type should have them or the sequence is different. That kinda could be the case with Olivia and explain why she is hard to type. She seems to have Fi but IXFP is out of the question. While I would agree that she is F it is quite a close call. Remember, mbti doesn't mean how good you are but it show your preference. She is often quite logical, calm and tries to blend out her emotions. Not just in situations that require this. So yeah, going with an abnormal IXFJ of some sort.
I always considered Broyles an ESTJ, but maybe I am too focused on superficial things (the way he dresses seems very odd for an ISTJ. He seems to care about being well dressed, ISTJ care about being adequatly dressed.) The other Broyles seems ESTP or ENTJ, we don't know that much about him and whole you might say "lol those types are very different" they can look quite similar if the information you have are very limited. Both are often action oriented bold leaders and have the urge to geht things done. I kinda had the same conclusion for the other universe Lincoln Lee as for their Broyles. I don't have a lot to gon on but my feeling is that alternate Lee is ENTJ and Colonel Broyles is ESTP. My strongest argument why the other Lee isn't an EXTP is the way he interacts with people. A lot of EXTPs crave for validation from others although they often try to mask it. Don't see that in Lee at all. He is sarcastic in a way that I see a lot in INTJs so ENTJ seems just more likely then ESTP.
Our Lincoln? I don't have a fucking clue. He is all over the place. One thing is certain: He is introverted as fuck. So yeah, introverted types which interact quite a lot with the outer world (and no, an ISTJ educating people about the rules they broke or an ISTP doing his hobbies is not "interacting with the outer world" in the way that I mean it) like INTJ or ISFP are unlikely. He is probaly S although INFJ could be a possibility. He could be T, he could be F. This isn't clear at all although F seems to be more likely but - as an example - ISTP are Ti-Doms but can be quite feelish (they probaly can be quite everything since they are ISTP and not being limited by rules is kind of their thing). He seems more J but he could be a reliable P. In my epxeriens ISXP are more structured than INXP. Not i a very narrow sense of the word, but still. So long story short: I am going nowhere with this and say ISFJ since this is what i consider the most likely combination of the ltters. But since this isn't how mbti works and the functions are what counts I could be way off.
Alternative Astrid? Clearly Ti-Dom. A lot of people would probaly say INTP and while that is a good guess I am going with ISTP. We have to remember that she is somewhere in the autism spectum. And while people on the internet kind of think to believe that INTJs and people with Asperger share a lot of traits as a person who has Asperger and knows others who also do I say no. Way closer to INTP. INTJs aren't as rational as a lot of people think. They are visionaries. So while she might come across as an INTP I think this is because of her handicap. Hell when I have a phase i can come across as an INTP. And I am ENTJ. And she is very into probability. Which is way more Ni and Se as the other way round. Perhaps she is an ISTP with switched secondary and tertiary functions.
Fauxlivia? I don't know. She is also sending some mixed signals but that could be caused by the role she played in the plot. The most common typing for her seems to be ESTP and yeah I can see that. I think her "jish" vibe was because she was for some time the villian. But since in my opinion STPs are probaly the most gifted when it comes to pretend to be somebody else this makes sense.
William Bell: Although he gives off an Ti vibe I tjink this is due to the actors and the roles we know him for. (not saying that spock is an NTP but he has a Ti vibe). Bell is most likely INTJ. His endgame was very Ni-Dom. The way he wanted to reach it takes INFJ out of the picture. Probaly the only other reasonable argument (but still very unlikely) is ISTP due to his feelings towards modern society and humanity. But yeah, also he isn't the NTJ clichee it is quite clear.
Robert David Jones? ENTX is quite certain. So he is into tech and he manipulates people and he risks destroying the world so he is ENTP? No. I don't see him as an nihilist. Someone somewhere dubbed ENTJs as "visionary thugs". Yeah. That fits Jones and his weird intersection of crime, terrorism and science. He doesn't tinker. He doesn't want to prove society something. Remember the scene where he killed a shapeshifter just to prove what he is capable of? Yeah, ENTJ.
A lot of stuff and I know that probaly nobody cares but since I am a huge Fringe fan it has to be said.