There are probably a lot of Cartoons where kids fight demons, although I only know of two. They are named Blood+ and Yu Yu Hakusho. As I said, there are probably many more, so neither of these may be what you're looking for.
It is in the episode, "Me Quest for Poopdeck Pappy". My favorite one as a kid.
'The Yellow Kid' .
Fillmore
Alvin
The cartoon WAS Nestor the long earred donkey...my kid was watching it today on DVD
'The Yellow Kid' is the first cartoon strip it being printed in the New York World on February 17, 1895 .
their choice a kid name y do u care
Snoopy .
yes.anyone can
Kid Notorious
The Yellow Kid debuted in 1894 .
Kanga - [Winnie The Pooh] Kid Notorious - [Kid Notorious] Kenny - [Southpark] Kit - [Kit 'n' Carlyle]