It's not like you get to see much of Princess Midna. You get the initial scene where she jokes about how beautiful she is, then she's off shattering the mirror. Her elegant stoicness can also be attributed to the fact she had developed a bit through her journey and was sad that she had to leave her blonde boy toy behind.

Kind of like Tetra. She acts nothing like a princess. Then she gets the dress and there's really not much of her original self there. (Again, because she has very little screen time after that.)

And as always, I'm all for TP getting a sequel where we can see more of Princess Midna.

The word you're looking for is not hilarious, it's sexy.