Prepare the spicy mayo by mixing mayonnaise and sriracha in a small bowl. Stir until the mixture becomes smooth and creamy. Taste and adjust the spice level if desired.
Cook the jasmine rice according to package instructions if it has not already been prepared. Once cooked, allow the rice to cool slightly so it is warm but not steaming hot when assembling the bowl.
Divide the cooked rice evenly between two serving bowls. Arrange the tuna, shredded carrots, sliced cucumber, diced avocado, and edamame neatly on top of the rice to create a colorful and balanced bowl.
Drizzle the spicy mayo over the bowl. Finish with sesame seeds, sliced green onions, and a light splash of soy sauce if desired. Serve immediately and enjoy warm or chilled.