K Blanka is awesome because K groove is awesome,
Like everyone said small jump is insane. Raged hes soooo scarey.
The only problem he can have is people turtling when he gets raged. The coolest way to beat that is to hop jump forward then super. It almost always tricks ur opponent and nails em for huge damage (u get great priority from any attemp made to stop u). Only catch is its hard to do.
Within hopping distance from your opponent charge back. As u do the motion to do ur super (back, forward, back, forward) tap the three kick buttons just before the first foward motion. The hard part is making sure the joystick is in a neutral position when u press the kick buttons. It takes practise. But once u get it wow what a difference for K Blanka. Once people start getting scared of forward hops u can always hop in and just grab (still does good damage raged).
Im still getting to know K Blanka but so far hes awesome and alota fun.