This is Yami Kula or Arrabella Rose, another version of super goddess kula-type. Indeed, she kinda strong even Hikari Hiel or Arrabella Aurora can't kill her. 
Her creation is based from Alsiel -An Original ALSIEL, which im using alsiel code and some other ripped effect from  touhou character. Indeed, some of her code i took from various orochi. I even took the code from private character which i copy it from unauthorize code. But i did modified some move and coding so she can be more like herself.

Side story for their both; - I did draw some doujinshi for this story, until my family found out and burn all my 5 volume of my doujinshi.

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Arrabella Aurora and Arrabella Rose is an guardian of Ame no Murakumo or other word, a Shrine Maiden that live inside the temple of Nirvana on the moon. They both live peacefully and loving each other until the god betrown them to the mortal world in order to seperate their forbidden love. They both being born again, as a human and as a twin sister. As their live in normal live, but then Arrabella Rose started to felling something weird toward to her little twin sister. And she reliaze that she have falling in love with her own little sister. The story move along until one day on both of them birthday, Arrabella Aurora have receive a love letter from a anonymous student that study in the same school. Her sister found out and they have a big fight in one night. Arrabella Rose confessed to her sister that she love her but Arrabella Aurora wont accept her love just because Arrabella Rose mad at her and she though her sister were playing with her. Arrabella Rose decided to leave the house to live on her own in order to forget her forbidden felling toward her sister.

So, the story move along, Arrabella Aurora gain her memory about her past, and Arrabella Rose being caught and being torture by Variya to be serve as a "Slave of Yamata No Orochi" to Shirabe; an Orochi's follower.

At final story, when the world in final pinch, Aurora sacrifice herself to save her sister. She make an promise to her sister that she will born again, as Rose's daughter. They make a final kiss and the world turn into normal again, it's like nothing happen. Rose finally can live normally but this time without her little sister. She always fell empty for no reason. And her life go on. Although her memory about her sister is being erased, Rose still can remember how deeply love she have to her little sister even she don't know/lost her memory about her little sister face.
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Basically, Aurora is represent a sun/light and Rose is represent a moon/dark.

So far, im planning to create 5 different Arrabella with different skill and sprite. 

What Arrabella i done
-Arrabella Rose [Dark] A.K.A Yami Kula
-Arrabella Aurora [Light] A.K.A Hikari Hiel
-Rose [A.K.A. Kula DarkDiamond]
-Aurora [A.K.A edited Aura by me]

Arrabella in planned is
-Arrabella Kameron
-Arrabella Ikarus
-Arrabella Alexendaria

Other character
-Ryougi Shiki / Based from The Garden Of the Sinner
-Flame/Api - (original K' Edit by me)
-Valkyrie Randgris

NOTE that her name Yami meaning DARK so all her skill are DARK TYPE. 
Her name, Naraku No Yuki is meaning Hell Snow, represent her characteristic in Demon form and
cruel voice according her name and sprite color.