Crazy, psychopathic, murderer ladies
Sexy, butt-kicking girls
Depressed emo/goth/always-dresses-in-black types
The brown-haired girl with no personality
The mean, popular, snobby girl
Unreasonably cruel bullies out to make life harder for the main character
The best friend (if they were a good character who *happened* to be a best friend they wouldn't have to be described as this)
Fun fact: Making victim OCs is cliche
Another fun fact: how someone dresses is NOT their personality
Yet another fun fact: People who claim to be random really are not and they know it.
Super bonus fun fact: A character's breast size need NEVER be stated. The end.
Super de duper bonus fun fact: Please, spare us the paragraphs on what the character looks like. It is a story, not a fashion show. A few sentences with mentions of hair color or other select features you find necessary to point out(KEYWORD: NECESSARY) are perfect. After all, how many paragraphs did JK Rowling describe Harry in? And yet we all know what he looks like... Plus, there are always these things called *pictures* you can take advantage of! especially on this fine art site
Super de duper bonus fun fact part 2: When you're describing a character (or explaining a background, etc.) you don't have to do it all at once. Pace it reasonably throughout the story or it will become too overwhelming for the reader. Think of creative ways that make describing things seem more necessary. Example: She pulled out a piece of her curly orange hair.
Turned crazy from being abused
Turned depressed from being abused
Turned anything from being abused
Family was murdered
Anything to do with a fire or a car crash
Anything that was invented for the purpose of making the audience feel bad for them, just to get their family out of the way or just for the sake of being dramatic/emotional.
Over-dramatic/emotional scenarios specifically designed for "fluff" (aka unbearable corny-ness that you will someday wake up and realize you feel like complete fool for writing)
Making it up as you go (aka no plot)
Fun fact: Dramatic scenes do require more skill to write than casual scenes and most of the times less is more. If you base a whole story on the most dramatic/emotional things you can think of you WILL regret it.
I repeat, less is more (I don't necessarily mean less dramatic scenes, but also less drama IN the scenes too. The less drama, the more surprised we'll be when your character pours out their heart or whatever, so save the drama for when it's really important).
Another fun fact: There is this come in handy-ish thing called suspense. Drama is the anti-suspense. Create a suspense that the drama can have fun destroying, because drama without suspense is dead. It needs something to feed on.
I know you're dying to get to the part where your character is sobbing their heart out, but let the readers get to know them first, or they won't care as much (if at all...).
In most cases the only way for us to get to fully know them is through light-hearted, casual, every-day scenes and situations (sometimes far more than just the dramatic ones). It's up to you to make THOSE interesting too, you know.
(Also consider whether the sobbing their heart out part is too corny or not. A lot of the times it really is. Be careful).
Example of over-dramatic/over-used scenario (a short and undetailed one to be precise): Your character is completely distraught and broken. They sit in a corner with their arms around their knees sobbing. Then their boyfriend comes up and comforts them.
If you have an emotional/dramatic scene like this think very carefully: Is this the kind of thing I want my grandchildren to see in years to come or is it something I'm going to want to burn in humiliation?
Yet one more fun fact: Stories don't HAVE to have romance in them *shockety shock shock*
The last fun fact: Don't look up to animes when you write. Things that pass in anime don't always in literature. They're all full of Mary Sues for one.
THINGS THAT PEOPLE THINK ARE "RANDOM"
Saying "I like *insert type of cute food/animal/object here*"
Basically anything else you got from internet memes or fads
Lyrics/links to songs (sorry, but music is personal and no one is going to think of it the way you do. Plus, adding lyrics that you didn't write in the middle of a story is unprofessional)
Rewriting a story just to add a love interest
(anyone who writes down scenes of a movie word for word frankly has no life)
Sex, drugs, alcohol, racial issues (basically anything you can report someone on clubpenguin for talking about)
Fun fact: The more swearing in your writing the more immature it sounds. It's a scientific fact.
(Granted, it could be realistic if it's the way of a certain culture etc., but I think it's safe to say: leave that to those who know what they're doing).
Please, read my new post: How Not to Tell a Story