The only difference on RP realms is:
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Naming rules, you can’t make a character named something that cannot be a RP name such as Lolusuck.
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You cannot harass anyone that is RP. If they chat with you in RP, you don’t have to reply in RP. You just need to respect their choices and not harass them.
There are no extra rules. People will claim that there are, but they are more like courtesies rather than rules. People would prefer if you use OOC and IC for Out Of Character, In Character, etc. but they are not required.