In a medium pot, combine rice, water, salt, rice vinegar, sugar, and sesame oil. Bring to a boil, reduce heat to low, cover, and simmer for 25 minutes until tender. Remove from heat and let rest covered for 10 minutes.
Heat olive oil in a sauté pan over medium heat. Crumble tofu into the pan and cook for 7–8 minutes until lightly golden. Add tamari, vegetarian oyster sauce, sriracha, and scallions. Cook 2 more minutes, then set aside.
In a covered pan, combine sweet potatoes, water, sesame oil, tamari, maple syrup, rice vinegar, and shichimi togarashi. Cook over medium heat until tender and liquid is absorbed. Set aside.
Whisk all sriracha mayo ingredients until smooth.
Whisk all wasabi mayo ingredients until smooth.
Preheat oven to 375°F (190°C). Spread sushi rice evenly in a baking dish. Layer tofu topping, then sweet potatoes. Drizzle with sriracha mayo.
Bake uncovered for 15–20 minutes until heated through.
Garnish with cucumber, scallions, avocado, sesame seeds, wasabi mayo, and furikake. Serve warm with roasted nori on the side.