I'm surprised you didn't add in Bleach. That shit has such an egregious timeskip it's downright awful.
Ichigo broods because he's lost his powers even though all he wanted was to live an ordinary life and this lets some new bad guys take advantage of him by promising him exactly that.
Rukia does not visit him once even though they are supposed to be super close to another another; neither does any other Shinigami because they're supposed to be morally grey or something and weren't allowed to?
Orihime does not make a single move on him despite her main rival being gone; he doesn't notice her love either.
I think there's some supplemental material that says
ackshually a lot happened in the timeskip and this all makes sense yadda yadda
Such a retarded shounen, I swear. I don't know about OP, but this really is on par with Naruto's timeskip (Jiraya teaching him jack shit).