Blanch the tofu noodles in boiling water, then drain well.
Cut the cucumber, avocado, and onion into bite-sized pieces.
Place the tuna in a bowl and season with soy sauce, sesame oil, and minced garlic.
Put the tofu noodles in a bowl, top with the prepared vegetables and the seasoned tuna.
Finish by sprinkling with seaweed flakes and sesame seeds.