RPers are a minority, but you can find them in smaller/more casual guilds, or just out and about in the world sans guild tag. If you want an RP guild full of rangers, check out Archer's Vow. (Also check out their guild thread, it's pretty awesome.)
My guild, Cracked Staff Artisans, naturally lends itself to RP, but the primary emphasis is on tradeskills so it's not for everyone. We're kind of the epitome of casual in all other areas.
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