First off, what Mae said - yup thats' what I go with
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Across RPs (i.e. in games and in forum RP and such) I have had some extremely powerful characters, charaxcters that could wipe the floor with every other character int he same game.
But they never do - because that's not fun at all! LOL They never do becuse I put character flaws, moral rules, and other such weaknesses as a part of their nature. Because in some games GMs (or other players) like to throw in "oober powerful kill kill" bad guys for charaxters to fight against, so my ooberpowerful character can hold their own with THOSE baddies, but with lesser characters I play lesser abilities. And then the characters weaknesses, moral code, flaws, mind issues, whatever and etc. play a part in how things RP out.
For example, I have a game where I play a full-powered archangel (From another plane). She can fly, she has an oober sword that not only has abilities of its own but is somewhat conscious, she has fire and air magic, she can't die (cuz she's an angel and she's imprisoned on this realm because of demons so this is actually torture, if she died that would be a hppy ending lol), and she has the ability that if you look he rin the eye she can control you/drive you insane/etc.
Have I ever used half of all that in the game? Nope. But the ability is there However, she has character and moral codes (cuz you know she's still an angel, even if imprisoned) where she follows the "natural balance" of things. She's anti-chaos (not good, just anti-chaos). Therefore she wouldnt' just run around subduing everyone to her will, staring at everyone and controlling them as her minions. She woulnd't even step in if someone was being killed in front of her. Her sword has a "midn of its own" so to speak and if she uses it to do something against her character, it won't let her do it.
So there are various rules and laws I put into that character that I stick to in order to make sure noone in the game goes "AWW OP OP!! YOU SUCK!" The other players have learned that I don't do that sort of thing, so they are all fine with it because they know I don't abuse such a powerful charater - and it gives them liberties to create really powerful bad guys and we have fun that way.
Weaknesses. Its all about weaknesses. And weaknesses that people can see and realize through your RP. A weakness does no good if noone but you knows or can find out about it. Kryptonite as a weakness for Superman does no good at all if there aren't deposits from space on Earth of Kryptonite for people to be able to use against him
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Then you don't RP with them. Seriously. Its a simple answer. If you are RPing with people whom you don't feel "play fair" then don't play with them. Step yourself out. If they ask you can explain, calmly and reasonably and politely, why you are uncomfortable with the RP and then move yourself on.
I don't care if 10 people who are RPing with them are fine with it - if you are not liking it don't force yourself to "go along" just cuz others are. They can RP with the group that doesn't care/is fine with it and you go RP with those you are comfortable with.
Its not your right to tell those 10 pepole (or 2 or 5 or 1) how to RP. FI they are happy with what htey are doing and others they RP with are fine then leave them to their game. And you go and RP with others.
The drama there starts when either 1 person thinks its "unfair" and begins lecturing the other 6 people that they are "wrong" and how al of them should then cater to this 1 person. OR The person being doing the "wrong" (as you see it) wants to force YOU or anyone else to play the way THEY want regardles of how you feel about it.
Neither of those are winnign situations - they are just drama. Have the self-assuredness to walk away from RP you don't enjoy, but not to destroy what others enjoy for themselves. And have the strength to defend your RP desire/values to someone else if they are trying to enforce theirs upon you.
If someone is RPing in a chatrom a charater that quite honestly for me, coudln't exist in Istaria, I don't RP. Now if I start RPing before I realize it, then I keep my interactions very superificial after I find out. If I'm the only person int eh room interacting with them, then I'll let them know why I won't be going any deeper (in a polite and respectful way OOC). They can either be fine iwht that and stay superficial, or they can choose to stop RP or change their character.
Just walk away. Its really that simple.