In Japanese what does it mean by adding the phrases?

Question

Hi I have been watching sub episodes of Sailor Moon.

Just wondering what does the phrases -san and -chan mean

I have an understanding that for an example Rei-chan is an affectionate term

what does it mean by Usagi-san?

I think there is another term but I am not sure.

I should explain that Usagi-san is an example of what I want to know.

Answer 1

These are 2 ways among many to suffix names. In a sense, it useful to think of them as Mr. and Mrs. However, this is useful only to get an idea of the meaning. They are used after first name or after last name, for adults or kids. San is moderately formal, but not as formal as sama. Chan is is much less formal, and is typically used for girls, in a friendly, affectionate way, as you mention.