For me, any cliche or overdone trope doesn't reside in the idea or character type but in the Rper. Pretty much everything have been over done in this world. There really isn't anything original. That being said, on the flip side, everything is original if it is your first time doing it. So sure, people could have done the same thing a thousand times but if it is the first time you have done it then it is new and fresh.
What I cannot stand is when someone breaks free or tries to break free from what they usually do in Rp and then fall back into the same rut as before. The D.S. or the Default Self. This is you rping as you would react or what you think would be funny or hilarious at the time and not staying true to the original character concept or where you wanted the character to evolve. As a GM who over sees many Rp's, much of whom have Rpers that are in more than one I host, I see this a lot. The characters will start off great and then over time I see them melt and meld into the D.S. so no matter the Rp, no matter the character, it just feels as if I am reading the same thing from the same character and I could just copy and paste 1 post to another Rp and no one would notice the difference because now there is no true difference beyond the surface.
That is the "cliche" I can't stand. When we lose the character and fade back away to the D.S.
This is a very good point. I have to watch myself with this, as I imagine we all do. If I'm tired, distracted, or just weary of the plot/character, it's easy to fall into this trap. If I sense I'm on the verge of doing this, that's my cue to take a break from the story and refocus.