I spend a lot of time on fanfiction.net. So I noticed trends, words that get used over and over AND over again. And not words like: 'and' or 'the', those are fine. But the same words used in the same way, BY EVERYBODY.
When did 'certain' become such a popular word to use in summaries? I can almost guarantee that at least two to three fanfictions on any fandom's main page will have some variation of 'a certain' + hair/eye color, somewhere in it's summary. Show me you have some kind of imagination to describe your story in a different way then everyone else. Drop the 'certain', we all know who you're talking about, it doesn't need to be there.