All nine Jinchuriki are immune to genjutsu, meaning that genjutsu can be cast upon them, but their Bijuu will simply kick them out of it.
The first eight Jinchuriki have the same type of transformations namely Red Chakra Cloak - Incomplete Transformation - Complete Transformation. The exception is Naruto, who has Red Chakra Cloak - Nine-Tailed Chakra Mode - Tailed Beast Mode.
If a person preforms, during a battle, a full transformation and can't finish the battle before the transformation ends, he automatically looses the battle.
To obtain a Bijuu bio that's already taken (as only one person per bio is allowed) you will first need to defeat the current owner as an extra requirement on top of all the other requirements listed below.
First comes first served, if you post the jinchi bio fist, you can take the test first.