It depends on context. It sometimes means 'crazy', and sometimes 'funny / hilarious'. If you want to go safe, おもしろい works fine. It covers a wide range of one's nature, mainly being interesting, and being funny. Also ユーモラス is fine, but maybe some people don't understand its meaning. 彼はユーモアがある/ he has a sense of humor / is better than using ユーモラス.