Sky Girls was a very light-hearted, feel-good anime that left a smile on my face at the end of nearly every episode. The interactions between the three main characters and their antics made this series a lot of fun to watch. Otoha was the quirky tomboy. Karen was the introvert brainiac. Eika was the serious disciplinarian. And later on, they're joined by Elise, the sharp-tongued tsundere. The story that went along with the character dynamics was also very well-done: it was a scifi, post-apocalyptic, alien-invasion sort of tale with some interesting twists.