In the play "Into the woods" the witch states, “You’re so nice. You’re not good, you’re not bad, you’re just nice. I’m not good, I’m not nice, I’m just right.” In the Websters dictionary it defines "nice, good, and right" as following:

•  To be a nice person is to be agreeable, polite, respectable, and a virtuous person.
•  A good person is some one who is virtuous, right, commendable, and kind.
• A person who is right is one who is being in accordance with what is just, good, or proper 

 My definitions are a bit different and it also depends on the situation at hand. How i feel is as follows: 

• To be a nice person is some one who does something for others out of the goodness of their heart. with out expecting nothing in return.
• A person who is good is someone who tries to do the best in the situation they are placed in.
• A person who is right is someone who is a mix between a nice person and a good person. They try their best to be nice to others, they're polite, and respects others and their faults, and is morally conscious of others.

I personally try to be all three. I feel at times that is my downfall but i know that I have done my best to treat others well and make them feel better than they were when I first met them, with making harming me or others.