Dinah-Fite, a heavyweight boxing legend that always ends her opponents with a BANG with her signature move, "Firecracker Fist". Dinah did retire after she lost a match and gained a huge belly and all, but she never loses her confidence in boxing, when she watches old archive videos of the glory days of old-school fist-fighting.

And ever since then, she opened up a junior league boxing gym to teach them for self-defense.

https://www.deviantart.com/trc-tooniversity/art/Dinah-Fite-855590464