here are some japanese words that i thought you might like to know.

aishertu: I Love You
arigato:thank you
arigato gozaimas: thank you very much
baka: idiot
bishoujo: beautiful young girl
bishounen: handsome young boy
chibi: kid or short
daijoubu: Are you alright? (when used as a question), It's alright (when replying)
dochirahe: how are you?
doujinshi: refers to a class of manga, books, and artwork that are produced by people or groups other than the series creators
glomp: to come up to another person and throw yourself onto him/her in a massive bear hug, often putting your cheeks together and hanging on long enough to make the other person irritated
gomen nasai: sorry
hai: yes
honto?: really?
Iie: no
ja ne: bye or see ya
kawaii: cute
kisama: roughly translated as "bastard!"
koi/koibito: boyfriend or girlfriend
koishii: Darling refering to a woman
konnichiwa: hello/good afternoon
konbanwa: good evening
kudasai:please
kuso: shit!
manga: Japanese comic books
minna/minna-san: everyone
nande: why?
nani: what?
Oi!: Hey!
omae o korosu: I will kill you.
onna: woman
Onegai: Please
otaku: freak
oyasumi nasai: good night
senshi: a celestial warrior
seiyuu: voice actor
tadaima: I'm home