Cook the rice according to the instructions on the package. Once cooked spread it out in a thin layer on a plate or sheet pan to cool. Set aside.
In a pot heat the oil on medium heat to 325 degrees.
Mix the flour, baking powder, and egg in a bowl. Season with salt. Slowly pour in the ice water while whisking until it reaches a smooth and thick consistency. You may not need all of the water.
Slice a chicken breast longways into strips about a 1/2 wide. (it needs to be long enough to properly fill the nori wrap)
Dip the chicken strip into the batter coating very well, then slowly immerse the chicken into the hot oil. Work in batches if needed as to not overcrowd the oil.
Cook for 3 - 5 minutes and gently turn the pieces over and cook until golden brown, about another 3 - 5 minutes until the internal temperature reaches 160 degrees using a thermometer. Drain on a paper towel lined plate.
In a bowl mix the mayo, sriracha, and ketchup. Set aside.
Moisten the nori sheets very lightly with water to make them pliable. Place the nori sheet on a bamboo sushi mat or parchment paper and spread a thin layer of the cooled rice. Place the carrot, cucumber, and fried chicken strip in the center of the nori sheet. Roll the sushi over while gently pressing down to create a tight roll.
Cut the roll into 1/2 inch slices. Serve with the mayo sriracha sauce, wasabi, and pickled ginger.