Since I pulled out the design notes from the second art book for the five tails earlier, I figured I'd pull out the little design blurbs for all the other bijuu too. It's all in this artbook if you're curious.
Unfortunately I couldn't get a clear shot of Gaara's blurb box from the video I used - I was still able to transcribe what was written regardless though. Only piece of text I didn't get a clear decipher of was whether it says that foxes and tanuki "never" get long, or "cannot" get along. Otherwise, what I wrote down for him specifically is basically accurate:
Jinchuriki Gaara (Sunagakure Village) - One Tail The concept behind Gaara's bijuu beast is a tanuki (racoon dog). In japanese folklore, foxes and tanuki cannot get along, so I thought I would make it a continued rivalry between him and Naruto. I really like the jagged and jutted-out jaw that the One Tail has.
Jinchuriki Ni'i Yugito (Kumogakure Village) - Two Tails This design was based on a creature called a futamata, which is essentially a cat that has grown a second tail after living for a very long time. Yugito is a very high-ranking kunoichi, and even Killer Bee gives her a lot of respect.
Jinchuriki Yagura (Kirigakure Village) - Three Tails At the time of serialization, other jinchuriki like Naruto and Gaara had already appeared. That's why I opted to have an extremely large tailed beast appear first. The basic concept of this beast is a turtle.
Jinchuriki Roshi (Iwagakure Village) - Four Tails This design was based on a gorilla…that or the giant monkey version of Goku from Dragon Ball. The horns on his forehead are made to look like the Monkey King in Chinese mythology. He can spit fire and lava.
Jinchuriki Han (Iwagakure Village) - Five Tails I combined a dolphin and a horse, but I couldn't really picture it and ended up with something that I don't really understand. Han wears armor made of steam and mostly uses ninjutsu that manipulates steam. In other words, he's the steam Jinchuriki.
Jinchuriki Utakata (Kirigakure Village) - Six Tails The Six Tails is kind of wiggly and looks like it might but won't shoot out lightning. Utakata uses ninjutsu that manipulates bubbles, making him a slippery opponent.
Jinchuriki Fu (Takigakure Village) - Seven Tails The basic concept of the Seven Tails is a bug. I made the exoskeleton of the book look more like a piece of armor and made the wings part of its tail. The jinchuriki is a girl, but aside from that, I haven't really decided on anything about her. (LOL)
Jinchuriki Killer Bee (Kumogakure Village) - Eight Tails The Eight Tails is like a cross between an octopus and a cow. I love how tasty the tails can look. Killer Bee usually speaks in rhymes. He's quite strong.
Jinchuriki Uzumaki Naruto (Konohagakure Village) - Nine Tails The basic concept of this beast is a fox. It is the strongest out of all the tailed beasts. It's so strong that I have no idea how to present it. (LOL)