I think "Mary-Sue" can be used too lightly when it comes to OCs. The short definition is, "A character who is perfect." That sums it up, but a BETTER definition is, "A character who is so perfect that she have no trouble overcoming obstacles."
Let's take a look at what usually labels a character as a Mary Sue:
1) Jaw-droppingly gorgeous (even though the character in question constantly states otherwise)
2) Gains the affections of others instantly with mininal/no effort
3) Extremely talented, although sometimes a flunk at at least one thing to make her more "relatable." Usually something that will have no effect on the story (Math, Physics, Drawing).
4) Able to master a skill in a short time period (Magic, swordfighting, etc)
5) Dramatic and/or tragic backstory (I.e.: orphaned; half-breed; peasant with noble heritage)
6) Sun-child of Supreme Destiny (for no good reason)
7) Her/his love interest(s) exsist for the sole purpose of being he/his love interest
8) Idealized self-insert of the author
9) Everything revolves around her
OP can be synonymous to Mary-Sue, but it really depends on what your interpretation is. For me, "OP" and "Mary-Sue" is the same thing: so powerful they have no difficulty overcoming problems.
Eragon from the Inheritance Cycle ai an example of a Mary-Sue. Let's see how many labels he falls under:
1) Not at first, but he becomes a real looker later on. Check!
2) Mostly yes. Check!
3) He mastered magic AND swordfighting in two months. Before that, he was a skilled archer. Check!
4) See (3). Check!
5) Orphaned and grew up as a poor farmboy, oblivious of his noble heritage. Check!
6) The only person in the world who can stop Galbatorix? Check!
7) I'd say Arya is more well-rounded than that. Nope.
Final score: 8/9
Let's say for a moment that Darkstalker is someone's OC. Incredibly powerful NightWing powers AND he's an animus? I think we'd all label him as OP. But is he?
Let's find out!
1) I wouldn't say so. Nope!
2) This one is a bit tricky. Post-exile, he could only communicate with Moon via telepathy, so he comes off as eerie and untrustworthy. Pre-exile, we don't know much about his people skills. But since the other NightWings decided that he was too dangerous and ambitious, I'll say nay.
3) His mind reading and future-sight powers are excceptionally strong. I'd say he's talented. Check!
4) Again, we don't know much about how fast he picks things up. N/A
5) I'd say he has a dramatic backstory. But since it seems likely that Darkstalker's past will become important, I won't mark this as a Mary-Sue trait. Nope!
7) I don't know much about Clearsight, except that she's STILL more interesting than Edward Cullen. Nope!
8) For some strange reason, I can't see him and Tui as the same person. Nope!
9) He's an important character, but Pyrrhia doesn't revolve around him. Nope!
Final score: 1/9
Verdict: Not a Mary-Sue
Although Darkstalker is very powerful, he isn't OP because he still fails at some things.
What makes perfect characters annoying is that we know they'll never fail at anything. We aren't concerned wether or not they'll succeed, so they become boring and bland.
But with characters like the Dragonets of Destiny and the Jade Winglet, who are well-rounded with struggles and flaws, we're worried about them. We care about them because they struggle.
The struggle of the character is what makes them interesting and what makes us care about them. We want to share their pain and sorrow. Without sacrifice and defeat, victory is bland and repetitive--there's nothing special about winning if you don't work for it. It's not something that can just be handed to you on a silver platter--you've got to earn it.
I hope that this has shed some light on the Mary-Sue situation. :)
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