Ok lets start off with this Blanka vs Bison. One of my personal favorite matches. I think blanka wins this one 60/40. The key to this match is making bison have as little options to come in on you as possible.
How do we accomplish this?
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Crouching strong for blanka snuffs out bisons flip kicks. Lot of bison players love to set the range just out of blankas counter hit range when he blocks. I Learned that if you throw crouching strong out he will beat the scissor kicks clean if dont early or on reaction. Now if it aint on reaction and you were late on doing crouching strong to bison the worst scenario is you trade hits. The funny thing is your crouching strong will do more to bison. So after a while of doing that I think bison will learn to drop the scissor kicks on blanka. Congragulations you just eliminated one of his key ground game attacks.
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Now that bison dont got scissor kicks for his ground game he is left with standing forward , strong and slides. Now all these can be taken care of with crouching fierce wich has longer range then all bisons attack. So as soon as bisons in territory throw one of there to keep him back and from getting in to do things.
3.Bisons new approach is jump in on you. This is easily delt with. Blanks straight up and fierce him. Dont jump at him. This is blankas best air to air counter or anti air. This will make bison have to do JD you or come up with something cause you just eliminated his air space.
Those 3 tactics work wonders on bison with blanka and try them out im sure they will help you out.