personality可数，有复数。复数形式是personalities。personality作名词意思是“生而为人；人格，人品，个性；人物；名人。”确实在中国的观点是性格属于不可数名词。但是可以理解为性格的种类，是可数名词，有复数的。
personality 造句
1. Their son is a real personality.
他们的儿子真是有个性。
2. His wife has a strong personality.
他妻子的个性很强。
3. She has such a kind, friendly personality.
她有着如此友善的性格。
4. His engaging personality made him popular with his peers.
他迷人的个性使他很受同龄人欢迎。
5. Everything you do or say is reflective of your personality.
你的一言一行都体现你的个性。