Meh. I would vote for Marco, but we are so much a like that it would be like voting for myself I think I'd have to go with Ax. I really like his honor complex. I just hope he can morph something a little more kiss-able.
Well, his human morph has that covered. I mean, heck, even when the other guys narrated in the books they gushed about how hot he was. I mean, he's turning straight boys gay, how much more kissable can you get?
And I mean, think about it: He's the perfect boyfriend. Need math homework done? He can do it in two seconds. Computer crashed? No problem! Free cable/internet? Done. You can dress him how you want because he's too naieve to care either way. You can train him to behave how you want because he doesn't know how to to begin with. If you're a golddigger, he's got that covered considering he can probably sell a primitive Andalite computer program for six or seven figures. Never gotta mow again because that's how he eats. He's got the loyalty and honor thing going, and that's never bad.
And all for what? A cinnamon bun.
Perfect man.