From Johou Battle

A foreseeing Nyuudou, a creature that would look down at its feet and decapitate anyone that dares look up at its head! This changed when he went for Ichirin, who looked down and recited the mantra "The foreseeying Nyuudou has been foreseen!"

Blown away by her bravery and courage, Unzan stood by her ever since. Unzan, being a cloud spirit, is capable of shifting his shape and size into whatever form he and Ichirin desires, even becoming massive if needed!

This helps outside combat too, as Byakuren often has Ichirin use his skills for the temple's physical labor and reaching high places. Despite all this power, Unzan is quite shy, only ever talking to Ichirin.

Is this Unzan's true form? Does Ichirin even know?