Mushu is a different dragon that Draco or Tiny Terror. He has the ability to talk like Draco, but not nearly as big. Mushu is about 8ft long, and stands about 3 ft high on his four legs. He can if concentrates sit up, balancing on his back legs which makes him about 6ft high. He can wind himself around trees, and as the ability to camouflage. He can also mimic statues, making him a good spy.
No one knows how old Mushu is, just one day he showed up to Katsumoto, and ended up art of the clan. When Nathan appeared, Mushu declared that Nathan was his human and he takes care of him.
There are running bets in Shogun on when Nathan will be able to walk across the large open field without tripping over Mushu, who slides in and around his feet while he does it. There has only been one moment in history where it almost happened. Nathan was recovering from the concentration camp and was stalking across the field – everyone watched holding their breath as he was only a few feet from the forest line – when he went down.
Katsumoto had found his Mate curled up with Mushu.
He helped Nathan deal with his ordeal. It’s the only reason he keeps the snarky annoying dragon around.