Preheat the oven to 400°F (200°C) and lightly grease a 9x13 inch baking dish.
Rinse the sushi rice until the water runs clear; cook with 2.5 cups of water until tender, then fold in rice vinegar, sugar, and salt while still warm.
Spread the seasoned rice into the prepared baking dish and press firmly into a flat, even layer.
Bake the salmon for 12-15 minutes on a separate tray until it flakes easily; remove the skin and shred the meat into small pieces with a fork.
In a medium bowl, combine the shredded salmon, softened cream cheese, Kewpie mayo, Sriracha, and soy sauce until the mixture is uniform.
Sprinkle a thick layer of furikake seasoning over the rice, then spread the salmon mixture evenly across the top.
Bake the entire dish for 15 minutes until the salmon topping is bubbly and slightly golden on the edges.
Drizzle with additional Sriracha and mayo to taste; garnish with sliced green onions and sesame seeds.
Serve immediately by scooping bite-sized portions into individual roasted nori sheets.