It's kind of hard to say right off the bat - I would tend to place role after the character itself. And to build a character, it helps to have an idea of the setting. Several are tempting; High Priest is always fun, since it really lets you nudge your way into the character of the kingdom. But I'm honestly feeling more of a "cunning" angle for this, I want to do some of the politicking. Which points towards Spymaster or Grand Diplomat.
It's hard to pick one; but between the two I think the Grand Diplomat role would have more... function? while we're getting things established, and builds nicely. Spymaster feels more like a "late game" role - I mean when you're just starting a kingdom, what's the spymaster keeping tabs on, five gremlisn who keep stealing socks?
So, grand diplomat for me; I'd be willing to trade if someone else wants it bad, though
Also, is it possible to double up, i.e, be an influential position and a "minor" one like Consort or Royal Enforcer (the ones with no penalty if you're missing it)