In a food processor, pulse shrimp. Place into a large bowl. Pulse corn, pepper, onion and jalapeno. Remove and drain through a sieve to get rid of extra water that the vegetables may release. Add to bowl along with 1 cup bread crumbs, hot sauce, chili powder and eggs. Stir well together. Form into cakes about 1-inch thick. Place in the refrigerator for 15 minutes to firm up.
Heat a large skillet with vegetable oil over medium heat.
In a shallow dish, add the remaining 1 cup of panko; add salt and pepper. Bread the cakes in the panko. Add the cakes in batches to the oil, cooking about 4 minutes per side. Remove to a paper towel lined sheet tray. Serve with relish.
Combine all ingredients in a small bowl. Chill until ready to serve.
The relish tastes better if made in a few days advance.