This show is very cute indeed! I like a concept of tiny alien frogs that live in a house on earth! It's has a lot of characters like Keroro,Giroro,Tamama,Kururu(personal favorite), and Dororo(other personal favorite). There's also a few main human characters in this series as well (like Natsumi, the girl that Giroro talks about all the time).
I like these kinds of anime because even though it's an anime, that doesn't mean that it has to be serious (like most of the anime on Adult Swim that I think is boring by the way).But the point is, I like this show for its colorful characters and comedy.