Kyle

Kyle is Rein's partner, Kyle was a boy who was scared of everything and had to live in a hut all by himself because of his property manager Jill. He found a strange "monster" named Rein and decided to care for his wounds. They became best friends.

As time goes on, Kyle's fears become bigger and bigger, even when Rein helped him against Jill. But eventually, when Gash arrived in town to help, he was still the same until he saw Rein's true form. After Rein's book was burned, he gained the courage to face Jill and managed to resist on his own, but even if Rein isn't there, he will ask other people for help, if his power is not enough. Kyle was last seen dancing when he saw that he received the letter from Rein of the Mamodo World.

(Source: Gash Bell Wiki)