Hello jiang,
You are asking a difficult question, because being ‘talkative’ or ‘childlike’ are not necessarily ‘good’ or ‘bad’ characteristics… Whether they are considered ‘good’ or ‘bad’ personality traits… well, it would depend on the circumstances. For example, a reporter would regard a ‘talkative’ interviewee as a responsive subject, whereas a ‘talkative’ neighbour could be seen as a tiresome (gossipy) person.
As for your second question, I think that if someone is kind and unselfish, you could say; he or she has charitable characteristics.
Doris

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