Thinly slice red and green bell pepper, then dice enough to get ¼ cup each green and red pepper. Set remaining sliced pepper aside. Thinly slice onion, then mince enough to get 2 tablespoons. Set remaining onion aside.
In a large bowl combine salmon, egg, crumbs, diced green and red bell pepper, minced onion, 1 tablespoon Cajun seasoning, and ½ teaspoon salt. Form mixture into small cakes, using a scant ¼ cup per cake.
Heat 1 tablespoon oil in a large nonstick skillet over medium. Fry cakes, turning once, until browned on both sides.
Wipe out skillet, place back over medium heat, and add remaining 1 tablespoon oil. Add sliced green and red bell pepper and onion and ¼ teaspoon salt and saute until softened, about 5 minutes.
In a small bowl mix together mayonnaise, paprika, remaining 1 teaspoon Cajun seasoning, relish, hot sauce, remaining ¼ teaspoon salt, and garlic powder.
To serve, divide sautéed peppers and onions between wraps, then top with salmon cakes and drizzle with sauce.