Seiga: Like I mentioned before, I wanted Seiga yukkuris to pass through walls in some fashion, but looking through the codes in DF that doesn't seem possible. Due to this, they'll likely be the most normal of the new yukkuris. The only thing I'll consider doing with them is placing them in the same area as the Yoshika yukkuris (thus showing thier connection) Here's hoping Yoshika don't eat the Seiga yukkuri (to be fair though yukkuris are like animals in most ways so this could be acceptable.)
Tojiko: I'm going to give her the ghost quriks that I used for my Myons, but with flesh properties. So she'll like be agile, and a good chance she'll be very NASTY. Since some of her danmaku centers around thunder and lightning. Why not let her shoot out lightning breath. She's probably suitable for an evil region probably to fit with the rest of the undead and also her dangerous ability
Futo: Amphibious, to match her "boat surfing" skills.
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lololol Plus more dangerous to fight in water she can attack faster in it! Thus STAY OUT OF THE WATER!. Again due to the bond with Tojiko, I'm considering putting her in the same region as Tojikkuris. So most likely evil region.
Mamizou: As I mention, she's replacing the racoon for obvious reasons. I'm considering giving her drinking habits too just to match her charater. And possible boosting her size a bit. Also need to make her more abvalible Say.... in place where a certain fox yukkuri stand. XD
Kasen: Peaceful, non threatening yukkuri on normal standards. Lives alone and in the mountains. I'm debating if it should be in a normal or good region where she should be. (probably good since we're lacking some yukkuri there.) Main idea for Kasen is to be a useful yukkuri to have as a pet that can help dispatch of some of your evil sprit problems. Since her bite will be able of paralyzing ghosts upon contact.
Miko: I haven't included Miko in the list for the same reason I never included Byakuren and Yukari yet. There needs to be a future update which can make better use of them and thier abilities. In other words (needs more magic and bonding updates) Her yukkuri will likely only be mentioned in art.