a fictional character with overly idealized and hackneyed mannerisms, lacking noteworthy flaws, and primarily functioning as a wish-fulfillment fantasy for the author or reader. Perhaps the single underlying feature of all characters described as "Mary Sues" is that they are too ostentatious for the audience's taste, or that the author seems to favor the character too highly. The author may seem to push how exceptional and wonderful the "Mary Sue" character is on his or her audience, sometimes leading the audience to dislike or even resent the character fairly quickly; such a character could be described as an "author's pet".
This is exactly what alt-Olivia is, otherwise known as Red in my other writings. Why do I say this? Well, in the first two seasons of Fringe, Olivia was constantly put into danger in one way or another in each case she worked. Red, on the other hand, was not. In the eight weeks that she replaced Olivia she was not once put into any kind of danger. What she did, however, was to thwart the team's efforts in any way she could, killed or ordered killed a large number of innocent people and even killed her own ally shapeshifters when they were in danger of being captured. When she was caught, she got taken back to her own universe and didn't even face consequences for any of her actions. The most telling Mary Sue trait was that she suffered absolutely no ill effects from crossing universes-twice. And she didn't have Olivia's cortexiphan protection either. When she got back to the control room at her HQ, she had the most smug, self-satisfied look on her face that I'd ever seen, a look that I still want to slap off her face. IOW, I am not one bit infatuated with that pretender and professional trelk (Farscapians know what I mean).
Olivia, while in Redverse, was drugged, brainwashed, put into all kinds of danger on her cases and ended up almost eviscerated when they wanted to study her brain before sending her empty body back in place of Red when they brought her home. Once home, she has to deal with the aftermath of Red's treachery, the way she stole her life and stole her love. More than likely, the rest of S3 will focus on the two of them as they deal with the treachery that was Red while they work cases and try to stop Redverse from destroying their Blueverse. Peter will have to deal with the fact that he was a complete dumbass who refused to see Red for who she was, even though there were several times before he received that enlightening phone call telling him Olivia was trapped in Redverse when Red just screamed that she wasn't Olivia. I mean, come on, when he asked her to repeat the numbers in 6955kHz, she first stalled by asking why he wanted them. Then, when she struggled to remember them and faltered a bit, where the real Olivia would have simply rattled them off like her driver's license, Peter totally didn't catch on. Please.....pass me the gag bucket.
Even the actress admitted to being infatuated with Red, so did some of the writers/producers.
So, unless the writers have some plan for Red to pay for what she did, I call Mary Sue!