Ultraman: The Cultivating Light Succubus

Li Xuan was preparing to break through to the Golden Core stage in his cave dwelling when he was caught in the shockwaves of a battle between two mighty beings. Before he could escape, everything went black. When he awoke, a man in a leather jacket stood beside him, and that man could transform into a gigantic silver giant.

Jun Himeya’s final battle helped Li Xuan understand a few things. While he was unconscious, Jun Himeya had given him a light of his own. After helping Komon Kazuki defeat Lucifer, Li Xuan began his journey to find a way back to his original world.

He crossed swords with Zero in the Land of Light, taught him swordsmanship, helped Hikari craft artifacts, helped Jugglus Juggler obtain a light of his own...

(Not invincible, and he won’t steal the local Ultramen’s big moments.)