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Roleplay (rp) is the assumption of a fictional characterâs identity for fun. Itâs like tabletop rpg only instead you write at varying levels of formality with living people who play other characters. Itâs like improv acting but in written form. Â IC refers to being in-character, and OOC out-of-character. Â You can write in past or presence tense, in long paragraphs or short sentences, or you can utilize a simpler and more informal format: Â Character: Dialogue. *action*. Â Which you choose is dependent upon your comfort level and your rp partner of the moment.Â
âMuseâ is rp lingo for the character, as you personally portray him/her/them.  âMunâ or âmundaneâ is rp lingo for you, the real person behind the character, controlling their actions.Â
I donât know to which of my smiling Loki icons (small pictures of the character displaying different emotions) you refer, but thereâs no greater meaning to using one more often than another aside liking it! :3Â
Is that helpful?Â
^This is a great little mini-explanation of RP.