Add leftover rice and water to a small pot and cook on medium heat. Once water comes to a boil, reduce heat to low and continue to cook until most of the water has evaporated (about 10 minutes).
While the rice and water are cooking, shred up the leftover chicken using two forks or your fingers.
Once your porridge has reached the desired consistency, add chicken and stir into the porridge;
Crack in the eggs and stir for about a minute until the yolks are broken up and the eggs are evenly mixed into the porridge.
Turn off the heat and add in soy sauce, sesame oil, and black pepper.
Ladle porridge into individual bowls and add a drizzle of sesame oil, Crumble up a few sheets of roasted nori and top with sliced green onions.