To back up what has already been said, you're best bet for an NPC shift, in order to ensure an RP role for yourself, is to sign up for a daytime Saturday shift (there is one in the morning and one in the afternoon). Just tell the person signing people up at sign in that you need a shift with RP-based opportunities, and she/he will be happy to help you out.
Defend the Land for it is the Base of the Pillar,
Elawyn Featherthorn Brightstar
Acolyte of the Circle of Ten & Chosen of Fey Lord Tillion
Guardian of Belladeen
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OOG: Kristen M.