These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ensemble Darkhorse: Karin has yet to star in her own series of stories, yet she is possibly THE most oft-appearing character in this 'verse.
Fan Wank: Happens more often than not during the course of trying to balance out the various crossovers. Of course, once a happy medium has been reached, somebody introduces another series and then they have to balance that.
God-Mode Sue: Flipflops depending on the author. Somewhat inevitable with so many different characters and writers involved, especially in a Mega Crossover — what is considered average in one continuity is super overpowered in another. It's very hard to balance everything and it often depends on the writer to try to make sense of it. Most of the time it's played for laughs, and the forum seems to do a decent job of hammering things back down to earth.