As a small business owner, I look for one strong quality, your attitude towards working, the culture, and other employees. If you often get hot-headed, angry, aggressive, and there is not fair reason to be, then it makes the environment uncomfortable for other individuals, and it's not a good fit.
In summary
Ask good questions, and have a good attitude towards life in general!
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I'll share two perspectives when answering this question!
From a personal perspective
Personally, I like to see the best quality being the ability to ask good questions. There's a really good article on asking good questions here, it outlines exactly what personally I look for in anyone
From a business perspective
As a small business owner, I look for one strong quality, your attitude towards working, the culture, and other employees. If you often get hot-headed, angry, aggressive, and there is not fair reason to be, then it makes the environment uncomfortable for other individuals, and it's not a good fit.
In summary
Ask good questions, and have a good attitude towards life in general!