My thoughts on OCs, let me show you them.

I'm of the opinion that sues and stus are more often than not in execution and not concept. Sure, there are concepts and character sheets that are just not redeemable, and require a generous amount of red-pen hack-and-slashery to rescue them from the bottom of the barrel. Those are the most extreme cases, and those are the ones that the litmus tests mostly apply to.

Basically, any character can be an attention-thief and a pain in the neck, depending on how they're written. If you have a very normal character, they can still fall into 'annoying' if they're written in such a way that the writer's "look, a virtuous Everyman!' gesticulation and self-promo is palpable. You can name me all the ways your character isn't a Sue or Stu, and they can be perfectly valid, but boy howdy will it ever fall apart in action.

( more babble beyond this snip! )

As usual, this is just my opinion, YMMV, all rights reserved, all lefts signalled well ahead of time, do not fold, sprinkle or masticate, discussion is good XD This is based on my experiences beta-reading and proofing stories for writers' craft classes and friends for ages, so - yeah. My experience is my own, and I know that others' views will differ. One only becomes wrong about experience when one insists that one's own is the default or only valid take, and I refuse to be that sort of ding-dong. XD