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Ludera pretty much hit the nail on the head. Personally, one of my joys of reading (and writing) fanfiction is to see how well an author works within canon restraints. I do not want to read a story that only seems to revolve around the author's OC---I want to see how well they stretched the limits with the canon and its characters, and see how they expanded on it.
OC's in and of themselves are not bad. Sometimes, you need to make up a character to serve your needs (for example, for a Batman fic, I needed to make up a store clerk. She was a minor character who basically served to distribute a lot of [unknown to her] tainted toys for the villain's scheme). A lot of times, minor characters like that are technically original characters, especially if canon has a lot of random unnamed police officers, shopkeepers, random innocent bystanders, etc. And sometimes, a story works to make an OC the main character (for a one-shot Nightmare Before Christmas fic, I had this cranky old woman as the main character, but the story was set up to allow Lock, Shock, and Barrel to prank her in the end to, hopefully, the satisfaction of the audience).
The usual trick is to not make the OC overpower the canon characters---and if you do, tread with care. Not saying that this has never been done well, but in my experience, when the OC is better at something than a canon, or rivals them for a position where canon states only one character can have (i.e., having someone other than Neo or Harry Potter being "The One," having a character steal a Batman villain's gimmick and do it better, having someone scarier than Jack Skellington), is when it gets into wall-banger territory, and where readers tend to get frustrated.
Just to be clear, you can have powerful characters. One good rule of thumb is to find something that is either ignored or uncommon in canon, and have them master that. Maybe your character is not The One, but maybe they have a skill that no one on the canon team has that is vital to saving the day. Or maybe your OC is the Big Bad, which will allow them a lot of screen time, yes, but also help the story focus on canon characters too.
The other irritation factor for me is romance, and having an OC only exist to bang the author's favorite character. Or to be picked on by all the canons and be right in the end. Or having their very existence throw the canon out of whack, because canon rules do not seem to apply to them (i.e., having a CD player work in Hogwarts, a ghost who still stays on Earth despite finishing their unfinished business is a Casper fic, etc.). Or pretty much tells the same canon story all over again, but with different character (i.e., one of Jack's kids discovers Valentine's Day, and the same events in the film happen all over again. The only difference is the change in holiday).
Overall, no matter who the OC is or how they are used, no matter how big or small their role in the story is, I want them to be believable. I think this is the other problem with OC's, especially ones written with bigger roles: a lot of them tend to be written poorly and riddled with cliches. There is a reason the Mary Sue Litmus Test exists (though, for the record, I consider it a list of traits that is useful as a guide only while keeping the canon of choice in mind as it is taken). A lot of the things that appear on it tend to appear in badly written characters in various fanfiction.
I guess in conclusion, the best OC's are ones that:
-Actually add something to the story
-Do not overpower canon characters, compete for a single canon position, or if they are powerful, bring something new to the table
-Do not overshadow canon characters, especially if they have a big role in the story
-Are not just there to fulfill the author's fantasies
-Do not give me a re-hash of the canon
-Follow the canon rules
-Are written well
Pretty much, follow those guidelines, and your OC is generally good to go.
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