i find it interesting that you seem to be saying that it is automaticaly a flaw for a fanfic to concentrate mainly on one or more OCs
I think this was directed, not at stories solely or primarily about OCs (or about canon names we've only seen once or twice which might as well, therefore, be OCs), but at stories in which the OC is inserted into the canon characters' established dynamic. So, while a story about Ravenclaw OCs A and B in Harry's year is perfectly fine, a story about Gryffindor OC in Harry's year who is suddenly inserted into the Harrycentric storyline and makes the trio a foursome is probably not.
More a matter of what the POINT of the OC is, really. Are you exploring the setting with different characters? Investigating life for the non-Chosen among us? Seeing what Harry's drama looks like from the outside? Or are you putting your OC in the main action, to "fix" everything (or even just one thing)? The latter is automatically a flaw, unless you are good enough to do something really special.
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I think this was directed, not at stories solely or primarily about OCs (or about canon names we've only seen once or twice which might as well, therefore, be OCs), but at stories in which the OC is inserted into the canon characters' established dynamic. So, while a story about Ravenclaw OCs A and B in Harry's year is perfectly fine, a story about Gryffindor OC in Harry's year who is suddenly inserted into the Harrycentric storyline and makes the trio a foursome is probably not.
More a matter of what the POINT of the OC is, really. Are you exploring the setting with different characters? Investigating life for the non-Chosen among us? Seeing what Harry's drama looks like from the outside? Or are you putting your OC in the main action, to "fix" everything (or even just one thing)? The latter is automatically a flaw, unless you are good enough to do something really special.