Here's a 1UP article on Blanka.
Also, here are some excerpts from the article:
Very quick and tricky, enables him to punish and mix up his opponent in a number of ways
Great assortment of command normals to help him deal with numerous situations
Ultra does great chip damage, hits low then high so great for using on unsuspecting opponents.
Limited combos mean most of his damage comes from single attacks and throws.
Cannot juggle into Ultra like some other characters can, and the Ultra itself is a bit of a gimmick once people understand it's tricks.
Notable Normal Moves
- Standing Hard Punch
- Crouching Hard Punch
- Down-Forward Hard Punch
- Crouching Hard Kick
Crouching LK, Standing LP, Hard Punch Rolling Attack
Standard close range combo. Useful after you cross up with jumping MK.
Crouching Medium Kick cancel into Hard Punch Rolling Attack or Hard Kick Vertical Roll
A combo to use when you are too far to land the crouching LK combo, and you can land either his Rolling Attack or Vertical Roll off the crouching Medium Kick
Crouching Medium Kick cancel into Hard Punch Rolling Attack, Level 1 Focus Attack
The Focus Attack does a bit more damage, but this is useful if they end up blocking the combo, you can still stay on the offensive. You can even try charging the Focus Attack to level 2 or 3 and try to land a a crumple!
Crouching Medium Kick, Ultra
This is a great way to land Blanka's Ultra if you have the timing down, just keep in mind you aren't canceling from the crouching Medium Kick, but instead you are waiting fr the MK to recover and then doing the Ultra. Your opponent will still be recovering from the C. MK attack and will end up being hit by the Ultra if you do it right!