Taiyoh is Japan in Mega Man ZX. The newly made Japan after Neo Arcadia's fall. They still remain technologically advanced over the rest of the world. Their main technological edge over the world is their Augmentations. They can replace an arm with a bionic arm within shorter amounts of time than other places in the world, and they can make it better than them; lighter, not as hard to fix up on their own, and so forth. Something new they've started doing publicly is augmenting human bodies themselves so those who can't stand Bionic Augmentation, or for those with weak frail bodies, or even those who prefer it. It is a safe procedure which is also expensive, but is free if it's needed due to Surgery, or they need enhancements and Bionic isn't available.

They've since then steered off their original course, and began attempting making soldiers. It is much more dangerous than the legal procedure. The procedure is much longer, and is 10x the original as it's not meant to heal, but instead, increase the abilities of Humans. As such, running at 23 miles an hour isn't a talent, but a sign of being slow. The soldiers who received this version of augmentation could jump as high as two stories, had a maximum running speed of over 40 miles per hour. That type of dangerous augmentation left only 13 soldiers left out of a test group of 100. 24 survived, but those 11 weren't heard from since. The remaining soldiers formed the Japanese, Anti-Maverick (and now Mega Man) force known as SAI.