Where to start....

Oh I just remembered another manga.
"Majin Tantei Nogami Neuro" it's about a demon detective who feeds on solving mysteries, but since he doesn't want his identity to be known in the human world, he makes a deal with a young girl whose father died mysteriously and she acts as a "Great Detective" for him, as long as he solves her father's death.

There's also an anime but it does it no justice.

 

Digimon and Nichijou.
Digimon is like Pokemon, except a lot better, and Nichijou is a short, hilarious anime about "everyday" high school life. The name, "Nichijou", literally means "everyday life" in Japanese. (of course, nothing's normal about it.)