Just about everyone can hit him with a meaty low attack as he comes back down(meaty as in have the hit frames of the move out and ready when he lands). Pretty much every character’s low roundhouse is capable of punishing him. Eventually he’ll have to stop doing it because he’s bleeding life from it. Again, don’t worry about beating it on the way up, you want to punish him right after he reaches the top of his DP, on the way down.
For E. Honda, DON’T use your HHS, torpedo, or the flying stomp. I see way too many players do HHS or torpedo trying to punish it, especially fierce torpedo when he’s all the way across the screen. There’s a very high percentage chance you’ll fuck it up and not too much reward for succeding really. High percentage plays are either a meaty crouching roundhouse kick , or attempting a button-up ochio throw as he lands. (Button-up because if you do it regular style and mistime it and get a punch his next SRK will hit you, while if you do it button-up style you get 3 input chances and if those fail you just block a shoryuken and take a little chip amage). If he’s doing it from across the screen to prevent you from using your fierce torpedo you can use jab or medium torpedo to close in and then use the roundhouse to hit him out of it. If he’s doing mindgames like sometimes doing a hadouken right on the landing of the first shoryuken then just play it safe and either use only jab torpedos or just walk your way over.
For Hawk, the command throw is a little riskier because of his whiff animation. Use a crouching roundhouse.
For Cammy, a crouching roundhouse works, and does a well-timed, well-zoned spinning backfist. The backfist is a little higher risk but does better damage, although you might be happy with just using the roundhouse to knock him down so you can pressure him from there. Cannon drill technically works but I find that it’s too easy to mistime, and then you eat a jab shoryuken.
I don’t play the other characters you listed much, so I can’t say what to do with them.
If you’re on an HDTV, read the HDTV lag FAQ and try to remove all your video lag. The lag from the internet connection makes it hard enough to punish this, you don’t need to make it even harder by adding HDTV lag to the equation.
Don’t listen to minty. I don’t throw around the word scrub like some people do, but I have to say, that is a golden example of scrub mindset.