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If this person is someone well known, read biographies about them, as well as articles. Watch interviews with them online and observe their mannerisms and personality. If you know the person, observe or listen to them regularly. Ask them questions about themselves to learn more about them. For example, if you admire a teacher, observe them in class and stop by office hours to talk to them. It's important to understand why you admire someone so you imitate their best qualities. Think about how the person dresses, acts, and otherwise carries themselves. Ask yourself which traits you admire. Is it their personal style you admire most? What about the way they carry themselves? Do you particularly like the way they speak or their great sense of humor? Once you figure out what you like about the person, try imitating that. For example, try making the types of jokes the person would make if you like their sense of humor. When you spend a lot of time with someone, you begin unconsciously imitating things like their voice. Making an effort to be around the person you're imitating will naturally make you speak and act more like them. If you admire a friend or classmates, try to make plans with that person regularly. Meet for coffee every Tuesday, for example. If you don't have a personal relationship with this person, you can do things like watch interviews with them online. While it is likely not as effective as spending one-on-one time with someone, you may take on some of their behavior if you watch videos of the person.
Learn whatever you can about the person. Pinpoint what qualities you admire about them. Spend time with the person, if possible.