So I've GM'd plenty of RPs but to be honest I've never had to properly remove a member from any of them, usually people resign. However recently I've had a member attempt to jack way too many aspects of my current RP. Don't get me wrong, I like to give creative freedom, stunting said creativity is a good way to kill a roleplay very quickly and I don't wish to watch this one crash and burn. There is one particular member though that concerns me. So far, we're only on page 2 of the IC and already this person has attempted to or succeeded in jacking the narrators role, the antagonists history, the surrounding world, and the creatures that inhabit it, and lastly trying to shoe horn in a MacGuffin Device. Again, we're only on page 2 of the RP and day 1 hasn't even ended. In character the story has only been going on for roughly 3 hours. On top of everything, not a single change they've desired to make has been so much as mentioned to me or any other members. So to other GMs and players, I'm wondering when you know when and how to remove someone from a roleplay. I'm not going to remove this person, but if the problem persists then I just might have to. I've even added a rule to try preventing this, a rule I thought I'd never have to explicitly say. If you want to change something that effects the world and/or important NPCs it has to go by me. I don't think this is a ridiculous rule, it's not like I will instantly reject the idea but I might want to modify it so it makes more narrative sense, but there are things that I have made non-negotiable because I have plans and goals for the story. Again, I want people to have their creative freedoms but hijacking the world and the plot and twisting it without so much as speaking to the GM is a little overboard. A lot overboard, actually. I don't know what kind of roleplays this person has been in in the past but usually when I make a roleplay I have a plan, a goal, a rough layout of the path to be taken but still allowing for deviations from this path and breaks for player contribution. Creating a linear story is not my objective and I would rather not have a player jack my goals and try changing them to suit what he wants to play. It's not his RP, it's mine, and I really don't want to be the guy that says "get out of my RP because it's mine not yours", the story should belong to all the players, which is why I really don't know when it comes time to boot a person or not. Am I being too strict or should I watch him like a hawk? Again, I've never had to boot someone before and I really don't want to be the [expletive deleted] that does. I have no problem being abrasive and assertive, I just don't know how much I should take before saying enough. Even if I'm in the right in watching him he wasn't warned yet so I will be keeping him in, it's not fair to not give him a chance.