Suffix: -sama
Examples: The villains call Beryl, Queen Beryl-sama. Sailor Moon calls Tuxedo Mask Tuxedo Kamen-sama.
Politeness: Professionals
Suffix: -sensei
Examples: Used for teachers, doctors, or anyone who is an expert or leaders in their field. Miss Haruna, the schoolteacher, is called Haruna-sensei or just Sensei.
Politeness: Normal Politeness
Suffix: -san
Examples: Used for everyone else.
Politeness: Senior Students
Suffix: -senpai
Examples: Title for an older schoolmate. It implies someone you look up to or whose examples you follow. Although it�s a formal term, it�s also used amongst friends. Sometimes used by girls even to address their own boyfriends if that boyfriend in an upper grade. Makoto (Lita) calls her �old boyfriend� senpai.
Politeness: Less formal
Suffix: -kun
Examples: Used between friends or to address someone more junior than yourself. Mostly used for males, but also used by bosses to address junior employees of either gender.
Politeness: Least formal
Suffix: -chan
Examples: Talking to best friends or to relatives. In Sailor Moon, the girls call each other Usagi-chan, Mako-chan, Ami-chan, etc.
Politeness: Pet names
Suffix: -chan
Examples: Usagi calls Mamoru Mamo-chan. -chan can be used for anything cute like children, babies, pet animals, or girls who are younger than yourself
Politeness: Pet names
Suffix: -ko
Examples: Mamoru calls Usagi Usako (-lo is a feminine ending). Not using any suffix indicate a close relationship which could include immediately family, childhood friends, or adult lovers. Sensei and Senpai can be used by themselves or as a suffix added to someone�s name.