1." What does he look like?" Yes, this is correct. You're asking about a person's physical appearance. 2." What is he like? " （ Is it the same as the first sentence?） This is also correct, but the meaning isn't necessarily the same. The question might be about his appearance, but this is also what you'd ask if you want to know about his personality, temperament, skills or any other details. It just means 'Tell me about him.' 3." How does he look like?" No. This is just wrong. 4. " How does he look?" You would ask this if the answer you're expecting is 'Fine' or 'OK' , 'Not bad' or 'Terrible'. It's asking for a judgement. For example, if someone had just got over an illness, you'd ask this to find out if he looked well or not. Or if you want someone's opinion on whether a person is dressed smartly or appropriately enough for an occasion, you would ask this. 5." How is he like?" No. This means nothing. 6. “He has the same weight as me?“ You use 'be' with your weight, not 'have'. For example, 'I'm 60 kg'. So the question should be 'Is he the same weight as me?'. Or to be strictly correct, 'Is he the same weight as I am?', but nobody worries too much about this use of the object pronoun nowadays.

#3 and #5 are not used. For #6, a better way to say that is, "he weighs the same as me?"