Bijuu, 3d ufficiale

Ichibi = Gaara del Deserto
Nibi = Nii Yugito
Sanbi = Yagusa
Yonbi = Roushi
Gobi = Han
Rokubi = Utakata
Nanabi = Fuu
Hachibi = Killerbee
Kyubi = Uzumaki Naruto

Ichibi = Gaara of the Sand
Nibi = Nii Yugito
Sanbi = Yagusa (So, he's NOT Yuukimaru )
Yonbi = Roushi
Gobi = Han
Rokubi = Utakata
Nanabi = Fuu
Hachibi = Kirabi
Kyubi = Uzumaki Naruto

Well, from my poor japanese language skills I can make out that Han (Five-tailed jinchuuriki) uses vapor, and his armor is somehow related to that. The tailed beast itself seems to be a merging of a horse and a beluga (in the author's own words).

Utakata (six-tailed jichuuriki) in fact uses bubblu ninjutsu (シャボン玉の忍術)

Five-tails's concept is a gorilla and it remembers the monster ape into which Songoku from Dragon Ball turnes to. His horns are based on the forehead "tiara" (bracelet? I don't know how to call it) used by the Songoku from the chinese legend. Apparently the bijuu spits lava.

Seven-tails is an insect rebembering a foreingn armor (like european armor, I think). Kishimoto further clarifies that she is a young girl (no more doubts there )

Some other things are preatty obvious, like, seven-tails' tails being wings and eight-tailes' being yummy-looking tentacles.

The bijuu - animal correspondence is something like:

ichibi - racoon dog (tanuki)
nibi - cat (neko)
sanbi - turtle (kame)
yonbi - gorilla (gorira)
gobi - beluga/dolphin and horse (iruka to uma - the author himself doesn't realy know)
rokubi - I think it isn't clear from the text, but apparently a slug
nanabi - bug (mushi)
hachibi - octopus and bull (tako to ushi)
kyuubi - ... suspese... fox (kitsune)

Concerning sanbi, Kishimoto says something along the lines of at the time he was serializing Naruto, as he introduced Naruto and Gaara as Jinchuuriki first, he wanted to show huge bijuus, so he designed this. He finishes saying it's a turtle.