He is evil. Beacuse in chapter 48, page 3&4, he tricked the Tang Monk. And in chapter 49, page 7&8, he knew Wukong is his father's friends, but he still treated Wukong very bad.
He is cunning. Because in chapter 53, page1&2, he changed into Guanyin and tricked bajie. And in chapter 53, page 1&2, he said he will be good, but when the sords dissppeared, he attacked Guanyin.
He is lucky. Because in chapter 53, page 3, Wukong wanted to kill him, but Guanyin let him to be her student, his life was saved