Some notable ones are ...
Homer Simpson or Huckleberry hound.
Hong Kong Phooey Homer Simpson
Astroboy
Jetsonsjenkins
Underdog is a cartoon dog. He begins with the letter U.
Alvin and the Chipmunks are cartoon characters. They begin with the letter A.
Archies
naruto
Droopy
X-Men
TAZ
Earthworm Jim