I always write my synopses in first person (my mss are first person present and I write chick-lit). I can't imagine writing in third. I hate third and can't write in third to save myself. Why write your synopsis in third when your ms is in first? I don't understand it. If the synopsis is better in first, gets your/your character's voice across and lets the ed. know exactly what's going on in the story, that's all that's important. Then again, I also write in Arial (naughty!).
Because dear one, your synopsis is not your novel, and you are not your novel. At some point you must recognize this. Sooner would be better than later. A synopis in the first person begs the question of how you remove yourself from the narrative at all. (On the other hand, let's all remember Miss Snark speaks of herself in the third person often, changes POV between paragraphs AND has a novel writing dawg---who is she to be talking weird, right?)
I'm not saying it can't work; strange things work all the time. Are you sending it to the crapometer? I'd love to see how you do this.
And Arial isn't that bad. Copperplate..bodoni bold...those are auto-rejects.