Whisk together the ingredients for the marinade (everything but the ahi) in a bowl. Add the chopped raw ahi and gently stir. Taste for flavor and add more sea salt and/or soy sauce to taste. Cover and refrigerate until ready to use.
Whisk together the ingredients for the wasabi mayo in a small bowl.Refrigerate until ready to use.
Cook rice according to package instructions. Once cooked, divide rice between 3 to 4 bowls and top with desired amount of mango, avocado, cucumber, pickled ginger, and ahi poke. Drizzle on desired amount of wasabi mayo, and serve with slices of roasted seaweed and sesame seeds.