I'm going to go against the grain (except for Tako) and vote Dragoon. Your explosive temper brings to mind dragoons like Cid Highwindvand Oerba Yun Fang, and you can only push other dragoons such as Kain or Kimahri before they're going to retaliate with a vengeance. You said it yourself - you come off as cranky and particular, but even so you have this fantastic sense of humour and friendliness that brings to mind those two dragoons I mentioned before.

Reliability is also a big trait I associate with dragoons, such as Kimahri and Fang. Those guys will always come through for their friends - I suppose that's also true of Kain! You're impulsive and slightly grudgy, and not massively extroverted.