Good bio,
Seth! & Welcome to the game.
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Folwren
Nice post!
I can't speak for Arry, but for my character, try to leave any conversations open for Riv to respond himself. Using what Riv's already said is certainly fine - but give me the chance to respond to anything your character says.
What Boro said is true - you can pre-arrange with another writer to carry his/her character in a scene or conversation. Otherwise, do it very minimally.
Just try to think of it as playing a game as a single character and not as writing a story where in some scenes you might handle several of the storyline characters.
~*~ Pio