Superman
1) the most important thing you can do (imo) is develop your post blocked breath game. Look into all of Supermans options, and find your counters. Do not just be satisfied with a counter to another F2. Superman has plenty of options to stop any meta 1 counters.
2) if your character has a punish for non MB air laser....find it, learn it, love it, convert it. Meter is Supermans lifeline. He builds it fast in most MUs, so forcing him to use it to stay safe on air lasers is critical.
3) develop your oki game. Rising grab is not a get out of jail free card. However we will abuse it until you teach us not to. Supermans wakeup game has all the options he needs, so make sure you have your characters options on lockdown so you can win some of the guessing games. Often, a knockdown into you guessing right on wakeup spells disaster for Superman because:
4) learn how to hold your life lead against Superman. Supes has this strange combination of bad comeback factor, and amazing comeback factor. It's bad because generally he opens you up by forcing you to a make a mistake. His 50/50 off throw vs f3 usually requires trait and meter so it's not always available. This means Superman can actually have problems opening you up to make his comeback if you are patient. However, he does life bars worth of damage in the corner, so there is still lots of potential if he does manage to open you up, which leads us to:
5) figure out your defensive options against SM in the corner. You're going to need them. Badly. Superman players have all spent their entire lives bullying people in the corner. They will know their options. You can't just have a day 1, meta 1 defense planned, or you'll get massacred. It's not easy, but figure out your characters most reliable ways to get out of the corner. You need them.
6) It's not as easy as "lol punish that" as everyone claims it is, but learn your punish for a divebomb. If you can manage to blow up one, you might actually make us Superman players hesitant to try again (probably not) but at least you got a combo instead of nothing.
7) Dont. Beat. Yourself. This is super (see what I did there?) important. This seems simple, but it's not. There are often setups players use that normally have a pretty high rate of opening someone up, so no one thinks twice. It's usually some fancy cross up setup. A corpse hop, a jump attack, a teleport, etc. I can not tell you how many times someone has tried one of these, I guess right and block it, and the opponent has cornered themselves. I then proceed to dismantle them in the corner because SMs corner game is so strong, and I didn't even have to work to get you there. Use caution. The risk reward is too high if Superman guesses right on your mix up. Save your fancy setups for midscreen, or for tech videos. If you do something to corner yourself against Superman, and he makes up a 75 percent life lead, that's not Supermans fault. You did the work for him.
I hope this helps everyone out in the SM matchup. He's a great character, very strong, but he's not actually bullet proof. There are ways around his madness. They may not be easy. But he isn't 10-0ing the cast. Oh, and if all else fails...
8) Pick Raven.