Touchme, I want YOU to pick a character. I do not know your writing style nor your psychological affinities. The sample you sent is, however, interesting. While I did say not to focus on the length, I do find your sample lean in content. But you have managed to bring out an atmosphere and an effect which I find very satisfying.
So, here's my suggestion: apply for Commander Kirk al'Lazaer. Edit your post, see if you can flesh out the scene a bit more. For instance, Kirk is a brilliant tactician. Try to bring out that nature in your words. How did he corner the enemy? What strategy did he use? What composition of soldiers is he using? How does he get into his enemy's shoes to figure him out? All these things will bring the character alive, I am sure. But these are only suggestions. Just dazzle me with what you have.