Sivvy basically has the voice of the black tattoo artist guy from that one tropical game (.....Far Cry 3?  You probably know whatever game it was since I never played it.)  Anywho, sorry to anyone who's actually Jamaican.  I've been trying to do purely aural research on  how to replicate that accent in text. I'll back it up with written research soon and try not to butcher it so much.  :)