It's easy to explain why Kouta is the way he is. He is the single most poorly written character in the history of fiction. No man in any possible universe could ever be that fucking big a pussy.
How do you take a decent, reasonably amusing show and turn it into rancid shit? Make Kouta the main character!
How is it possible to watch ones testicles wither away, die, and fall off over the course of half an hour? Watch episode 12 of Kanokon!
What would possess one to invade the Eureka Seven world to beg Renton(no matter what you think about his 14 year old isms, the occasional whining, and his goofy ass face, the kid's got balls to spare.) to give up a testicle for transplant? To stick it into bloody Kouta so he'd at least somewhat resemble a man so that this show would become watchable!
I ended up continuing to watch because Akane hits all my switches just the right way. If she had been the heroine, Tayura the protagonist, and Kouta's harem a fanservicey sideshow, it might have been a pretty good show.
Do the new specials have any Akane service? Or is it all Kouta centered?