Phalanx or Avion. Basically the two flyers.
The physics when battling them is so much fun. The first time you fall off a wing only to catch onto the other or another hundreds of feet in the air to save yourself is one of the greatest moments in gaming.
Pelagia is cool too.
They're all cool.
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Avion was awesome, the first time he swooped I misjudged it and got smacked in the face. Second time I was ready for action. Phalanx was breathtaking but I got a bit irritated when I kept missing the jump.