I have just recently discovered Sgt. Frog. Currently reading vol. 2. This has to be the funniest manga I've ever read, Bobobo notwithstanding
. Bobobo's tendency towards random and prolonged goofball tangents seems to work best as an anime. As a manga I just couldn't get into it. But Sgt. Frog throws random, goofball jokes into a story that consistently makes sense (or enough sense to follow along with anyway). There is occasional fanservice-based humor, but no actual nudity and it's not really pervasive. But enough analyzation. The point is, it's a great manga and if you've been missing out on this gem for too long like I had been, you need to go fix that right now. 
