Blanka: You can grab (or tech for that matter), it’s just your reactions that are making you believe you can’t. You have to learn the timing of the Hop so you can appropriately react. For instance, if I know that Blanka will Hop -> Grab, ideally, I would do a Tornado Throw since TT beats grab. This puts me in a position to control the match now. But be careful with trying that, because Blanka can adapt to you and Neutral Jump to make the TT whiff, and proceed to do whatever they want.
For electricity, I would go into training mode and record the distance at which your buddy pins you in the corner, and experiment with which poke will beat it out (if the electricity is a farther distance away). Alternatively, you can EX Roll out of the corner and it will go through Electricity.
Blocked Blanka Balls can be punished with Soulless easily. I personally wouldn’t use Breathless in this match up. If you tag a Blanka with Soulless off of a Blanka Ball it will make them hesitant to throw them out for the rest of the match (considering it didn’t kill him). I believe you can hit Blanka with Soulless even if the Blanka Ball hits you.
As for E. Honda, I don’t really have too much experience with him. I’m sure someone else in the Abel forums can explain this a bit more.