LOL, these replies are hilarious. Seriously guys just answer the dude’s question for what it is.
Very good question. My opinion: I would have to go with a fast invincible reversal option. Unfortunately you did not go into enough detail when describing that option (which is understandable since it’s a very complex thing to describe). There are many types of fast invincible reversal options, some more useful than others. Some reversal options such as dp’s also have the additional use of being excellent anti-airs. Invincibility can also come through the way of an armor point such as Abel’s EX COD or Balgrog’s EX punches. Some ex throws could also be considered invincible reversal options (which brings up the question of what exactly is it invincible to, everything?) Another thing this brings up is the amount of meter required to initiate this type of reversal. Another thing to consider is whether this reversal is able to be fadc. If so, this makes it very scary since it can be both safe and invincible on defense while being safe and invincible perhaps on offense as well.
The most powerful form of this is the generic shoto dp b/c it is motion instead of charge, can typically be used as anti-air in addition to reversal, comes out very quick with generally good invincibility, and can generally be fadc which provides it with both extremely powerful defensive and offensive damage capabilities.
I know there are many exceptions to what I just said as I was speaking very generally. I also know that just because a shoto dp is very powerful, that does not mean that shotos are therefore OP. I think shotos happen to be pretty well designed/balanced in this game. But every once in a while their strengths will bring out the raging demon in me.
Edit: If I was to say anything should be universal, it would most likely be a two hit move. Every character could possibly deserve some sort of normal or special to deal with focus attack. Yes, every character does have a special move to deal with it, but some just stink at that. Yes, some characters have very fast walk speeds and can literally just walk up throw to deal with it. And yes, I could be completely wrong about this and some characters might actually become OP if they were given two hit moves that deal with focus attacks. It’s possible that weakness against focus attack could be the only balancing a character out… Tough questions indeed!