Prepare the sauces: In three small mixing bowls, prepare the sweet soy ginger sauce, sriracha aioli, and white truffle sauce separately. Whisk each until smooth, then set aside.
Cut the ahi tuna: Using a sharp chef's knife and cutting board, pat the ahi dry and cut it into small, even cubes. Add the tuna to a medium mixing bowl with soy sauce, sesame oil, rice vinegar, green onion, and sesame seeds. Gently mix and refrigerate until ready to assemble.
Prepare the wontons: Cut the wonton wrappers into triangles. Heat neutral oil in a large frying pan or skillet over medium to medium-high heat.
Fry until crisp: Using kitchen tongs or a slotted spoon, fry the wonton pieces in small batches until golden and crisp. Transfer them to a paper towel-lined plate and lightly season with salt. Let them cool uncovered so they stay crunchy.
Prepare the toppings: Use the chef's knife and cutting board to dice the avocado, thinly slice the serrano, slice the green onions, and chop the cilantro. Keep the nori and sesame seeds ready for assembly.
Assemble the nachos: Arrange the crispy wontons on a serving platter. Add a little diced avocado and marinated ahi to each wonton.
Add the sauces: Using a spoon or small squeeze bottle, lightly drizzle the sriracha aioli, sweet soy ginger sauce, and white truffle sauce over the nachos. Avoid adding too much sauce because the wontons can soften quickly.
Finish and serve: Top with serrano slices, green onion, cilantro, shredded nori, and sesame seeds. Serve immediately while the wontons are still crisp.