Why instantly Bishounen? It clearly would not work here.
Art style like FT, Naruto and Bleach would do well.
OP really suffers from its distorted art.
Talking about long lasting series... looks like Hajime No Ippo hit a 1004 chapter
That's much more than One Piece... I really don't get authors. Don't they have any other ideas they would like to realize?
Regarding Hell Girl, I find it too episodic. To top it most of the characters are morons and pull the string for everything even though problems could have been avoided.