Each actor has his own personality.

每个男演员都有他自己的个性。

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Each individual has his own personality.

每个人都有自己的个性。

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Each individual boy in the class has his own personality.

这个班上的每个男孩都有自己的个性。

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Robertson never sought formal acting training, based on advice that he should keep his own personality, according to his biography.

CNN: Cowboy actor Dale Robertson dead at 89

The second is harder to define, but it seems to be the ability to infiltrate his own personality into a part.

ECONOMIST: Theatre history

As his director, De Niro helped Matt Damon to play a character that, at times, was very different from his own personality.

CNN: Q&A: Robert De Niro interview