Greetings, Sayings
Arigatou -- Thank you
Do-itashimashite -- You are welcome
Gomenasai, Gomen -- Sorry
Ja ne -- See ya
Konichi wa -- Hello
Ohayo -- Good morning
Sayo-nara -- Good-bye
Konbanwa -- Good evening

Name Suffixes
-chan -- a cute way of referring to someone you know well.
-san -- loosely translated as "Mr." or "Mrs."
-sama -- More honorific than -san. Sometimes translated as "Lord" or "Lady".
-tachi -- Means, that person, and everyone with him or her.

People
Anata -- You
Minna -- everybody
oka-san- mother
oto-san -- father
oniisan -- elder brother
one-san, (neesan, neechan) -- elder sister
oto-tosan -- little brother
imo-tosan -- little sister
oba-san -- grandmother
ojiisan -- grandfather

Explicatives, insults
Baka -- fool, stupid, idiot
Hentai -- pervert
Shimatta -- oh no! Damn it!
Yare -- Oh dear!, Ah!, My my

Misc.
Dare -- who?
Do-ishite -- Why?
Genki -- happy
Hai -- yes
Himitsu -- secret (Sore wa himitsu – That's a secret. A phrase Xelloss uses.)
Iie -- no
Itai -- Ouch
Kawaii -- cute
Namagomi -- raw garbage
Nani -- what?
Sore wa -- That
Sugoi -- Wow, Neat
Wakarimasen -- I don't understand