I'm trying to remember the name of an anime, It's about a pricess that runs of her planet and she is helped by the enemy planet (Earth), there, she found a boy (he's very smart and antisocial, he loses a eye in the final) that helps her stay in disguise and regain her throne. If I remember correctly that is an anime of 2015 or something closer.
Gundam Build Fighters was good. Gundam Seed was okay. Knights and Magic was my favourite robot anime, though.