Here are some ways to answer in English, depending on the context:
For "What are you like?":
* "I'm friendly/outgoing/shy/reserved/creative/organized/..." - Describe your personality traits.
* "I'm a people person/an introvert/a bookworm/an artist/..." - Describe your general character.
* "I'm a student/a teacher/a musician/..." - Describe your profession or interests.
For "How are you?":
* "I'm good, thanks! How about you?" - A general and polite response.
* "I'm doing well/okay/pretty good/not so great/..." - Depending on your mood.
* "I'm tired/busy/excited/..." - Share how you're feeling.
Remember to tailor your answer to the situation and your relationship with the person asking the question.