Cut the salmon and tuna into bite-sized pieces.
Dice the avocado, cucumber, and onion.
Mix soy sauce, sesame oil, and vinegar into the rice and stir well.
Place the rice in a bowl and top with the prepared ingredients.
Drizzle mayonnaise, sriracha sauce, and other sauces over the top.
Finish with a sprinkle of sesame seeds and seaweed flakes.