Dragon here didn't get perhaps the wild feats of Karate Kid, but I'd say his showings are regardless very impressive, especially for someone who spent nearly all of his appearances in self-contained stories.

Scan 1/2- A strike from a Bruce Lee student/Jeet Kune Do master that would crack bone doesn't alongside multiple other shots (Richard Dragon, Kung-Fu Fighter #14)

Scan 3- Dragon and this student fight for hours, taking blows that would also shatter stone alongside the above for presumably that amount of time; Dragon has no visual injuries afterwards and is only exhausted

Scan 1/2- Being hit with a mace to the shoulder by the best master of the mace in the world only stings, Dragon then disarms him and beats him in 15 seconds anyway (Richard Dragon, Kung-Fu Fighter #3)

No-sells having a staff driven into his stomach (Richard Dragon, Kung-Fu Fighter #14)

Tanks a nunchuck to the face unexpectedly (The Brave and the Bold #132)

Scan 1/2- Tanks being thrown from a boat high in the air and into a steel floor (Richard Dragon, Kung-Fu Fighter #17)

Scan 1/2/3- Tanks running through a burning house (though it does sting him badly) before one-shotting the villain of the issue with a afterimage-inducing strike (Richard Dragon, Kung-Fu Fighter #10)

Scan 4- Despite being hospitalised and in a sprint early next issue Dragon is able to fight off a would-be armed assassin in full Samurai gear, sending him flying out of a window with a kick (Richard Dragon, Kung-Fu Fighter #11)

Scan 1/2- Uses Ki to make himself no sell multiple savate strikes to the face while doing nothing to defend himsef (Richard Dragon, Kung-Fu Fighter #2)