Japanese construction boots (jika-tabi). Steel toe, thin and flexible minimalist soles (about the same as Vibram Fivefingers), and the split toe allows for toe spread (which improves balance on the job site) :
Teenage Mutant Ninja Turtles x Fila M-Squad | Complex
adidas | Shoes | Adidas Zx800 Kawasaki Ninja Shoes With Three Pairs Of Adidas Socks | Poshmark
Teenage Mutant Ninja Turtles Kids' TMNT Light Up Sneaker Toddler/Little Kid | Famous Footwear
Ninja Tabi Shoes Summer Cotton Fabric Boots With Leather Art - Etsy Canada
Gaucho Ninja | Barefoot shoes | Tabi boots | Made in England
Black 'Ninja' shoes FERRAGAMO - Vitkac Canada
Gaucho Ninja | Barefoot shoes | Tabi boots | Made in England
Outdoor Ninja Tabi Boots for all those doing Ninjutsu training - Enso Martial Arts Shop Bristol