Belzebub, of course! I now proceed to kill your flist with images. SORRY BUT I MUST!
The main protagonists. Don't you just want to read it by looking at it? No, how about this?
How about thispic or the other? Regardless, you must obey!
BABY BEEL ORDERS YOU TO READ ABOUT HIM HERE:
http://www.onemanga.com/Beelzebub/ It is only 35 chapters and full of lots of lulz, you will like it. A light series to take the edge of daily life. Of course, if you like delinquents and gang girls, this is a manga for you. It is awesome