I want to be the person like him

want 是谓语动词,后接不定式to do,这里do变为BE动词,成为to be
the person 是宾语
like him 做后置定语修饰the person
此句可完整写为：I want to be person who likes him.
（当the person 是只那个人时,后应用likes ,当the person 指那种人时可用like.）