When I was very young, I can remember my All-Time cartoon hero was a Character named “Prince Planet” that came on daily right after grammar school. Most of you may still remember him. “He was the guy that flew around with this Roman Centurian type helmet on and carried this big Gas Gauge around his neck that gave him energy” I think his last showing was somewhere back in 1974. When I began my Teen years, My newly found idol became Conan the Cimmerian. Ther were a few others like Speed Racer and others, but for me Prince Planet and Conan were by far me favorites. Who were your Heroes whenyou were little 
Gigantor.
Moving this to Cafe Society.
Betty Boop. Still is.
Racer X (who, unknown to Speed, is really his older brother, Rex Racer, who ran away from home years ago).
I always thought he was very cool.
Gadget Hackwrench.
“Spaaaaaace Ghoooooooost!”
and “Race” Bannon.
Ignatz, that little brick-throwing mouse on Krazy Kat. He was a " l’il darlin’ ".
Hong Kong Phooey!
Probably not very politically correct, but he was cool. (At least to five-year-old ggurl!)
Oooh, this one’s tough. I think the overall answer is going to have to be Wonder Woman. But Gloop and Gleep from the Herculoids might come close.
And I do have something of a soft spot for Jem. I mean, c’mon, she was truly outrageous. And sometime in the 80’s, I had the same earrings. 
I spent way too many hours watching Bugs and the rest of the Warner Brothers gang not to give them a mention. Also watched a lot of Woody the Woodpecker and back in those days any time Donald or Mickey were on Disney it was a huge treat.
Optimus Prime. Then again, he’s still my hero.
Dating myself here, but my earliest hero was Crusader Rabbit. :eek:
In comic books, I was a serious Legion Of Super Heroes fan. But I don’t recall favoring one hero over the others.
I don’t know if I should confess to this.
Marine Boy ::hangs head in shame::
But that was a long long time ago.
Favourite cartoon would’ve been Tom and Jerry* narrowly pipped these days by vintage (pre Chuck Jones) Daffy Duck.
*the 1940s Fred Quimby ones not the later crap. Actually crap is far too good a word for them but this ain’t the pit.
Definitely Wonder Woman. Her character’s name was Diana, which is close to my name. I had a little shorts/halter/jumper outfit that sort of resembled the Wonder Woman costume, so I’d put that on and grab a piece of rope (Remember that lasso-of-truth thingy she had? She’d rope someone and they’d be forced to tell the truth.), then go outside and rope the forsythia shrubs and make them tell me the truth!
::singing::
Wonder Wo-maaaan
She was followed closely by my other hero, for which there wasn’t a cartoon… The Bionic Woman.
Isis - You really don’t want to know how many times I said “Oh Zephyr Winds which blow on high, lift me now so I can fly.”
Never worked tho.
Wonder Woman!
All the world is waiting for you
And the power you possess!
In your satin tights
Fighting for your rights
And the old red white and bluuuuuuue!!!
Wonder Woman!!
::clears throat:
Sorry about that, just having a little moment there.
She was so cool! And Dogzilla, I had the “Underoos” WW outfit – complete with bulletproof bracelets, tiara, belt and golden lasso. I remember being THRILLED when my mom gave it to me.
Oddly enough, at age 4 I had a crush on Neptina, the mermaid on Marine Boy.
Oddly enough, she was topless in that kiddie cartoon, circa 68. I guess I knew what was what, even back then.
For me it would have to be the crew of the Argo/Space Battleship Yamato in “Star Blazers.” The show was my introduction to Japanese animation, and remains my all-time favorite. The characters were heroic but flawed, and the suspense of whether they’d make it to Iscandar in time was almost enough to give me ulcers at age eight!
We’re off to outer space!
We’re leaving Mother Earth!
To save the human race!
Ooouuur Staaaaar Blaaazerrrrrrrs!
The chick crew member in Battle of the Planets or G-Force or whatever it was called. I SOOOO wanted to be her when I grew up. I’d watch every morning before school.