Honorifics

-chan	Using the -chan honorific with a name [ie. Usagi-chan] denotes familiararity. Usually this honorific is used with close female friends, children, and pets. Using -chan for someone older than yourself is considered *very* rude.
-dono	This is a very rarely used suffix nowadays, and considered archaic. In the 18-19th century, however, it was used towards one's superior (much like -sama), but with significant personal respect as well. All personal feelings, however, were - the Japanese being the Japanese, after all - reserved for special occasions only. So, a typical samurai would call his superiors "-sama", but only the highest-ranking and/or most favored samurai would be allowed to call his lord "-dono". Similar to "my lord", as opposed to the purely professional "sir". (Submitted by: MaXxX)
-hime	This is only used for a princess as it means "princess". (Bunny-hime = Princess Bunny)
-ko	Using the -ko honorific with a name [ie. Usa-ko] denotes familiararity with a female. Mamoru calls Usagi "Usa-ko" after they start dating.
-kun	Using the -kun honorific denotes a relationship between boys that grew up together, a boss to an employee, female students to male students, older students to younger students, and sometimes even for females students (seen in Nurse Angel Ririka SOS).
no honorific	This denotes a VERY CLOSE relationship between two people. [ie. Haruka & Michiru, Usagi & Rei]. By no means does using no honorific imply there is something other than a platonic relationship, but it doesn't mean that it doesn't. You must go by a case by case basis.
-sama	Using the -sama honorific with a name [ie. Usagi-sama] denotes formality and deep respect. Usually used with royalty, leaders, or someone you *really* respect. Think of it as Lord/Lady or Master/Mistress.
-san	Using the -san honorific with a name [ie. Usagi-san, Tsukino-san] denotes formality. Think of it as Mr/Miss/Mrs. Usually a younger person to older adult, classmates, or people unfamiliar/unclose with each other.
-tachi	Attaching -tachi to the end of a word is a pluralization method. Senshi (meaning soldier) written as senshi-tachi becomes 'soldiers'. As watashi (meaning "I") becomes "we" when written as watashi-tachi.

Words with Honorifics

ane-ki	Ane means "older sister" but is not necessarily used for blood relations. It is used by someone referring to an tough older and senior "big sister" figure. Think of a female gang leader being called this by her followers.
ani-ki /ani-ue	Ani means "older brother" but is not necessarily used for blood relations. It is sometimes used by someone referring to an older and senior "big brother" figure. The "ani-ki" version is for more rustic or "tough" personalities. The "ani-ue" is a more refined and elegant use of the term.
oba-san	Middle-aged woman, aunt.
obaa-san	Grandmother.
oji-san	Middle-aged man, uncle.
ojii-san	Grandfather
ojoo-san	Young girl, some else's daughter.
okaa-san	Mother.
onee-san	Older sister.
onii-san	Older brother.
otoo-san	Father.
ouji-sama	Prince
oujo-sama	Princess