Like every character on Glee, Blaine has his fair share of problems, character-wise, and his choices and characterization did not always make sense.
Blaine Anderson (aka Darren Criss) was perhaps the most successful addition to the Glee cast ever. He had a real backstory, was different from other characters already on the show, wasn't showing up to fill the spot of someone who had "graduated" and brought some excellent acapella to the program.
However, like every character on Glee, Blaine has his fair share of problems, character-wise. His choices and characterization did not always make sense, no matter how long he was on the program. It wasn't just about him finding his feet on the show because a lot of Blaine's character problems came in later seasons.
10 Meeting With Sebastian
Sebastian first appeared in season three of Glee. He is very clearly set up as the antagonist of season three and yet Blaine continues to put himself in Sebastian's path. Despite having transferred schools because of his feelings for Kurt, Blaine still continues to meet with Sebastian, despite Sebastian's unashamed flirting.
It doesn't make sense in terms of Blaine's previous choices or the kind of person that fans were led to believe Blaine was. It was clearly contrived without taking into consideration who Blaine was supposed to be.
9 Playing Tony
Upon transferring to McKinley High School to be with Kurt, one of the first things Blaine does is break his promise not to try out for the role of Tony in West Side Story. Not only does he sing a Tony song to audition, but he also accepts the part when, surprise, it is offered to him.
It's a very weird power move to make as so soon after appearing on McKinely's campus. It was also not a great move to make against a friend like Kurt.
8 Telling Burt To Have "The Talk"
Not only is Blaine a high schooler, but he also has feelings for Kurt (whether or not he's fully admitting them to himself). Telling Kurt's dad to have "the talk" with his son is overstepping a lot of boundaries.
It doesn't make sense that a young teenager would be advising a grown man and father on this particular course of action. It's not his place and it's pretty inappropriate at that, and a little uncomfortable to watch.
7 He Has An Older Brother
Of course, anyone can have an older brother, but the fact that Blaine's brother shows up so randomly and prominently in an episode didn't exactly feel natural when watching the show.
After having transferred schools so many seasons before, the timing of Blaine's elder sib showing up doesn't exactly make sense in terms of plot.
6 Dating Karofsky
Blaine is so aware of bullying and the very particular history of Karofsky bullying Kurt, that it doesn't make any sense at all that he would ever date him in Kurt's absence.
Of course, he would help Karofsky, if that's what Karofsky asked for, even Kurt was willing to help Karofsky, but dating him is an entirely different step. It has a bit of a gross-out factor to it and feels more like revenge or drama than a real choice that Blaine would make.
5 Being Jealous Of Kurt
When Kurt starts getting attention from other students at NYADA, Blaine can't quite handle it. Blaine is the one who is known for cheating on Kurt, not the other way around.
It doesn't make sense that he should become so jealous. Instead of being proud of Kurt, or being pleased he's started to build a life for himself in New York, he can't quite get around the fact that people are interested in Kurt. It's hard to believe Kurt and Blaine are meant for each other when Blaine is so insecure.
4 Thinking About Rachel
If Blaine had been bi, that would not have been a problem, but what that doesn't make sense is his romantic feelings for Rachel in particular. While they kiss at a crazy glee party, in the light of day, he should remember how self-centered Rachel is, and the hard time she is always giving Kurt.
This should be enough to put him off Rachel, even if he wanted to explore his sexuality further with someone else.
3 Not Dating Before Proposing
By the time Blaine proposes to Kurt on Glee, the pair have not actually been together and dating for some time. A proposal should never be a rebound action, and on-screen, that's certainly how it appears. Blaine and Kurt have so much history, it doesn't make sense that Blaine wouldn't take the time they need to embrace that before making the big ask.
It felt like the most rushed part of their relationship and arc on the show. It was strange that Blaine wouldn't want to try and really win back Kurt first before trying to bind them together. It makes the proposal feel a little desperate.
2 Transferring To McKinley
Blaine is popular and successful at a private school and yet he transfers to public school for a boy who he's not even really with yet. It's kind, but it doesn't quite make sense.
It's a very quick change and doesn't seem to have been discussed with any adults. For a student who's already in high school and probably looking to go to college, it's quite the shake-up of a transcript and would raise a lot of questions from admissions officers.
1 Staying At McKinley
Kurt is older than Blaine and yet, even when he heads off to New York City, Blaine remains at McKinley until he also graduates. Sure, he has friends at McKinley by then, but he also still had friends and just as long of a history at Dalton.
If getting into NYADA was so important, he probably would have done better to return to Dalton, where students were applying to a wider variety of schools.
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