Natso Fast hangs out near Mantis Rock, offering players the chance to try his Foot Race. If players accept his challenge, his Foot Race takes players through the Path of the Mantis and leads to the Hidden Dojo in the Great Tree.
In beta testing, Natso Fast wore a classic Red Ninja Gi and carried a corseque. For most of beta testing, Natso Fast was unnamed, with his current name originally belonging to Boris Toobsox.
Natso Fast's name is a play on "not so fast", a phrase telling someone to stop.