Letting Them Down Gently

I've only GMed a few group RP's, and to be honest, they didn't succeed very well. I'm working on a new RP, which I'm going to be GMing, and foreseeing a future problem I wanted your input on it.

Say a character just God-Modded, taking the story completely of tangent, making themselves the master of the story and crushing all other character beneath their six inch stiletto heels. How do you politely, without inciting a riot, let them know that they need to fix this? And that if they don't fix it, you have to remove them from the RP?

Or even before that, if someone submits a Mary Sue character sheet, or something else along those lines, how do you tell them to change it? And even after they changed it, if it's still not right for your RP, how do you tell them that that character isn't acceptable?

Is it better to let them down gently or to just flat out tell them the truth, in a more blunt fashion? If you want to let them down gently, how do you go about doing so?

Personally I'd rather let them down gently, but I'm a pushover. Working up the courage to tell them It isn't good enough is hard enough as it is, I tend to be too gentle about it. I usually tell them what specifically isn't okay in as sweet a way as I can manage, and politely ask them to fix it. But how do you think it's best to go about this? What have you seen go over succesfully, and what have you seen fail miserably?

"You can beat me, you can kick me, you can spread my blood all over the pretty white floor. But you can never break what isn't yours. I belong to my Lord."

Source: http://feedproxy.google.com/~r/RolePlayGateway/~3/2XsqghkK-xw/viewtopic.php

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