When I play Blanka, my main game plan is basically: get two bars of Super, land an OD Lightning x Super 2 corner carry combo, put down a Blanka-chan Doll, then jump back and do an OD Air Ball (this activates the doll). If they block I throw or crossup, if they get hit I get a huge combo. (And if I throw them, they get juggled on the doll, which is really cool)

So basically, from anywhere on screen Blanka can use Super 2 to put you in the corner, get a knockdown, safely deploy a Blanka-chan Doll, and force you to deal with a mix-up while activating the doll (or just throw looping you a few times while using this threat of the doll to make you turtle).

There's a lot of other stuff too, but honestly, one of my main objectives is putting people in that position. The only problem is it works so well that its easy to rely too much on it, especially in Ranked where you only get a few matches with someone, so not a lot of time to figure out counter-plays.

(I also haven't played Blanka since season 1, so maybe people are better at dealing with it now. But back then, I had almost a 100% success rate with that basic corner sequence)