At a guess, as readers of fanfiction, we all have our buttons, not just the good ones which make us love a story immediately but also the ones that take us right out of the narrative. Doesn't always have to be something glaring, or something that would even matter to any other reader, but they exist. I've found some of mine in just about every fandom I was/am in, though it usually takes a while for me to discover what they are. After three quarters of a year of watching Heroes and reading Heroes fanfic, I have come to the conclusion that the following things especially annoy me when they show up in a story:

( Entirely subjective list in no particular order, spoilers for both seasons )