She was Ryogi Nagi, the captain of the second division of the Seireitei Gotei 13th Division. She was assassinated by Aizen.
She woke up and became Minazuki Nagi's sister, but she didn't have a name, and they looked very similar.
He was hit by a car on the street and turned into an undead wandering in the depths of Nagi.
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The CPs in this article are Nagi (not the one from Kurom) and Liudao Hai.
My design is that Chrom and Nagi look exactly the same, right down to their eye patches and pineapple heads... Except for their clothes and weapons, Nagi is wearing a Death Overlord outfit with a Zanpakutō across his waist...