Cook and season rice: Prepare sushi rice according to package directions. While still warm, gently fold in rice vinegar, sugar, and salt. Let cool slightly.
Make spicy mayo: In a medium bowl, whisk together mayonnaise, sriracha, sesame oil, and soy sauce until smooth and creamy.
Prepare crab mixture: Add chopped crab meat to the spicy mayo and toss gently until evenly coated. Taste and adjust heat level.
Prep toppings: Dice avocado, slice cucumber, shred carrots, and prepare edamame. Cut nori into thin strips.
Assemble bowls: Divide seasoned rice between 4 serving bowls. Spoon spicy crab mixture over rice. Arrange avocado, cucumber, carrots, and edamame around the crab.
Add finishing touches: Sprinkle with nori strips, sesame seeds, and green onions. Drizzle with extra spicy mayo if desired.
Serve immediately: Serve with pickled ginger, wasabi, and soy sauce on the side. Enjoy your Spicy Crab Sushi Bowl!