There are two meanings of "他人". Here is the first meaning.
1, the person. 他这个人 short for 他人.
in here: 他人很好=the person ' s a nice guy.
2, another person. 其他人 short for 他人.
like:如果你不能确定他人的感受,你可以提问。
If you’re not sure of how another person feels, ask them。