Using a sharp knife, cleanly and carefully dice tuna into roughly ½ inch cubes. Take your time and make long cuts in one direction - don't saw at it.
Combine diced tuna, 3 tbsp of the poke sauce, and green onions into a bowl and gently mix until tuna is coated.
Hand separate (if using flake style) or dice (if using leg style) imitation crab meat.
Combine imitation crab meat, mayonnaise, and sriracha into a bowl and mix until imitation crab is coated. Taste the mixture and add salt or sriracha to your liking.
Into a bowl, add roughly 1 cup of the cooked sushi rice.
Top rice with cucumbers, carrots, edamame, avocado, kale, tuna, and imitation crab in amounts based on your own preferences.
Add some of the poke sauce, garnish with sesame seeds, and optionally drizzle on some sriracha. Serve immediately and enjoy!