Name Suffixes (attached at the end of Japanese names):

(Information provided by Sailor Moon Resource Book from Amazon.com written and designed by Mark C. MacKinnon)

In Japan, suffixes are added to names to indicate respect, affection, gender, titles, etc.  Lack of a name suffix indicates that two people have a very close relationship.

- chan

   Used for younger children (especially girls), but also used to indicate affection or endearment.  For example, the Inner Senshi usually call each other "Usagi-chan", "Rei-chan", "Ami-chan", etc.   The Outer Senshi are older and more mature than the Inner Senshi and therefore use the -chan suffix when referring to them as well.  When Usagi and Chibi-Usa call Mamoru "Mamo-chan", they are using the suffix as a term of endearment.

- ko

  Used as a permanent suffix on a female name, such as Minako.

- kun

  Used for male friends or acquaintances who are younger or the same age as the speaker.  In the fifth season, for example, the Inner Senshi call Kou Seiya "Seiya-kun", and Kou Yaten "Yaten-kun".

- sama

  Used for formal respect, such as when one refers to royalty.   For example, the young cat, Diana, addresses Mamoru and Usagi using the -sama suffix since they will eventually be the King and Queen of the Earth.

- san

  Used as a term of respect when referring to people older than the speaker, or to people with whom the speaker is not very familiar.  For example, the Inner Senshi call Haruka "Haruka-san" and Michiru "Michiru-san".