Alright, I've decided to bring in Yasu's underling.
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Name: Alius
Nickname: Dark Kaika (when she was first thought to be Kaika's negativity), Shadow Replicator
Age: ??? (probably as old as the beginning of time, or a bit younger than Yasu's existence)
Gender: ??? (presumed female after fully replicating Kaika's soul and body)
Abilities: Alius is well known for her unique ability to merge into a living being's body, and either stay and become a negative conscious to the being or leave the body and transform into a "replica" of the living being she merged in last. If she is merged with someone too long, then she is able to create the replica of their body as much as she pleases, as seen as Alius can turn into the form of Kaika without having to merge with the girl anymore. Her replicated bodies give her a small fraction of what the living being's abilities were (for example, merges with Naruto, transforms into Naruto and gains access to a weak Rasengan), but that can be powered back up by adding Shadow Essence to the replicated abilities (which is why Alius also replicates the person's soul so the abilities are as accurate as possible.) Her replicated body actually acts like armor, guarding her frail Shadow Replica form from harm, and repeated attacks to a certain part of her replicated body will cause it to fall apart. Her other minor abilities are summoning other Shadow Replicas and even Shadow Primes, and manipulating the darkness.
Species: Shadow Replica / Demon
Appearance:
[img=http://movellas-users.s3.amazonaws.com/comment/201303260426231895/201308291848107469.jpg]
(her normal Shadow Replica appearance. When she is in a replicated body of someone else, the only way to tell if it's a fake is that the eyes have a very light shade of red.)
From: Lifestream
Other: None.