In a nice big serving plate, mash tuna using a fork. Add rice and stir to combine.
Cut the avocado in half, using a sharp knife, slice through the avocado lengthwise until you feel the knife hit the pit. Remove the pit and dice avocado into cubes.
Add avocado, corn, tomatoes, and red onion. Carefully mix. Season with salt and pepper to taste and drizzle with olive oil.
Slice eggs into quarter. Arrange them on top of the salad. Garnish with green onion.