No, you fool, Kangaroo Man. Check out the handy origin in the caption in the very first panel:
Yes, you're right, that is the best concept for a comic book EVER.
Kangaroo Man (& Bingo) were created by S.M. Iger and Chuck Winters in Choice Comics #1 (1941). The feature lasted only 3 issues (as did Choice Comic) But oh, what a three issues.
First let's meet Bingo:
Let's recap the origin again:
Let's just says the Nazis quickly learn that you don't bring a hand grenade to a kangaroo fight:
And Bingo, believe it or not, is the master of aerial combat!
This is the greatest thing ever. And the best part is, it surely must be public domain, so anyone can swoop in and start creating Kangaroo Man (& Bingo) stories (after paying me a small finders' fee, of course)! Sure, the concept may be too silly for stick-up-the-butt DC these days, but Marvel must have room for this! Dark Horse? Dynamite? BOOM!? Anybody...?
Panel from Choice Comics #1 (1941) and #2 (1942)