I generally have a certain peeve against the so called "perfect ocs". The ocs that have an idol as family has worked in different companies. And their only flaws is being overemotional; clumsy and oblivious. It gets annoying sometimes for applyfic authors to write a character with such a broad personality. Your more likely willing to like a character who has a harsh, evil personality who slips up and forgets other than a character made just to fall inlove and be popular.
This leads to my next nit pick. The fact some ocs are made just to be another's love interests'. Most of the time it leads to boring, cliche ocs that you can predict. Of course it could work out as a way to make ocs but most of the time it's pointless.