Thanks a lot,se16teddy. How would an English-speaking person rephrase the sentence "She's a little Cleopatra...."? Something like "She behaves like Cleopatra"?Sorry, I misunderstood the question.
Where a historical or literary character is an archetype, we sometimes treat the name as countable:
She's a little Cleopatra. Even though she is only twelve, she insists on wearing lipstick.
All his friends are Lotharios.
Your question has a difficulty: to be a Cleopatra" differs greatly from "to be a little Cleopatra." It would be far better without "little" - "little" makes it quite difficult to answer clearly because its significance has to be explained.
"She's a little Cleopatra...."? = (i) "She is very young but has [some of] the attributes of Cleopatra." or "She has [some of] the less positive attributes of Cleopatra." or "She has some indications of the attributes of Cleopatra but in a charming way."
Little in [little + noun/proper noun] can mean (i) small/young or (ii) be a negative intensifier, (iii) a moderating adjective.