I believe that RJ is someone from PJ's past. According to the last episode it was revealed that RJ has 'real powers' so I am assuming that is someone from his childhood/puberty years that was close to the him and his father while they were performing their psychic acts. 

I believe RJ is someone around Jane's age or slightly older that he had very strong powers when he was young but PJ somehow 'stole the show' and he became extremely famous. One more argument that I believe enhances my suspicion that RJ somehow is linked to that specific part of PJ's past is that, at the last episode it was said that RJ killed a happy memory that nobody knew about. I believe someone knew about it and that is RJ. I am assuming that PJ was hypnotised in the past by RJ so that the latter could prove his power to the first one and he traced that memory while PJ was under hypnosis. That memory and many others of course.


P.S I was so certain that RJ was Shettrick at some point because of the male characteristics she has, and also has red hair, and also her voice was weird reminding me RJ's voice. So I thought it was RJ dressed like a woman justifying that way the contradiction in his name Red (feminine) John (male). But then I thought that RJ doesn't seem to be someone who has direct involvement with the CBI or FBI, but he has lots of accomplices over there. He is someone external but someone from PJ's past.

Its pretty obvious that Kristina Frye is Red John. She makes the only sense in the entire show. The other characters have no weight or legs to stand on to be Red John.

Pretty sure Patrick Jane's 7 member list definitely has Red John's accomplices on, but she is the puppet master stringing them along.

I read a submission somewhere here where the submitter spoke about the He Is mar - and that Jared Renfrew meant to write He Is marionette (The definition of Marionette - A marionette is a puppet controlled from above using wires or strings depending on regional variations. A marionette's puppeteer is called a Manipulator).
Remember Jared didnt know who Red John was, but only said that he had really important information on Red John.

She makes the only sense if you have watched the entire series, and add it all up.

She is the only character who as shown similar mental superiority to Patrick
She also mysteriously disappeared during the Season 2 finale and conveniently Red John shows up to save Patricks life from the student filmmakers/copycat killers., recites a Tyger,Tyger poem and then leaves Patrick with the Rolltide statement.
Also when she disappeared from heavy police protection, her passport was taken as well. (Why would Red John do that if she wasnt Red John)
She as survived the fatal on TV dissing of Red John
She shook Patrick's hand
She knows that Patricks daughter was asleep when she was killed (Psychic powers come on - she was there so she knows)
Painting of toenails is definitely a women's thing
She has not been present in the show for a while, so this would be a major twist. A writers method of getting viewers to forget about a character so that it would be a major surprise when Red John is revealed.

I think Rosalind's physical description of RJ can be ruled out, for two reasons:

1. PJ's list of suspects (if it is assumed to be complete and real) does not strictly adhere to how Rosalind described Roy to be.

2. When Lisbon asked if she was on the list, PJ said she isn't, because he'd call what they have a friendship, and not because she's female, and RJ is male, according to Rosalind. 

Now, I'm not saying that RJ can't be the way Rosalind described him to be- I'm just saying Jane doesn't trust her description and isn't bounded by it.

I also think the list of suspects is not complete, again for two reasons:

1. We are all forgetting about the "He is Mar/Man" clue written on the wall when RJ's accomplice died. Other than Ellis Mars, it doesn't exactly point to anyone else on the list.

2. RJ is a very central part of the show, he's almost as much important as PJ. But the suspects, i.e. RJ's assumed alter ego/real identity have hardly ever been seen to be interesting, or of any importance to the storyline beyond a few things here and there or a few episodes. RJ has to be someone who has a connection to Jane, in my opinion, because otherwise, it just falls short of the show's intriguing dramatic twists.

Another thing: correct me if I'm wrong, but when PJ gave the interview that got his family killed, he was already approached by police to help catch RJ, right? Given how connected RJ is, and his obsession with PJ, what are the odds that he himself had set that up?

I'd like to believe that RJ is someone from PJ's past, simply because he is so obsessed with PJ. RJ killed the other serial killer who mocked him on TV, but PJ, he's kept alive and has been toying with, even deviating from his MO to mess with Jane. 

I think it'd be someone Jane shook hands with back in his own life, but forgot to factor in, just for the shock factor. RJ's revelation is the climax of the shock, it has to be important.

If RJ is indeed any one on the list, PJ can just shoot him and get on with his life. He is not even close to any of these people- in a love or hate way, their death is not going to affect him in any way. But RJ, I'd like to believe, would pose a question to PJ.

Anyone agree?

Something I thought didn't make sense.  At the end of the first season finale the guy that Jane shot said that red john 'wanted you bad'.   For what???  He has his chance to do whatever he wanted to do to Jane at end of 2nd season finale but does nothing.