Blood+, Shikabane Hime: Aka Recommendations
Both are centered around an undead girl who fights other undead creatures. Both have a boy with a connection to the girl as their lead. Both have disappointing action scenes and kind of a cheesy aura of sadness hanging over the girl, with the boy sort of having this attitude of wanting to save her.
They look really alike because in the two case there is a girl who isn't really human. The two of them also have to kill some strange monster and they have a boy without power who support them.
They're both alike with how both of the main characters are girls who have to destory/fight monsters; also, both of the monsters in them are like vampires too. Ouri and Kai are the same really, bystanders who get casted off to the side because they're "useless", per say. I found that while watching Shikabane Hime: Aka, it had some rather simliar aspects to Blood+, with the vampire(-like) concept and the fact of the "living dead."
Very similar in the fighting styles. Both women have something in common even though one is a vampire creature and the other is a dead killer they are fighting for the common good. There is a level of mystery in both and they are both actually very decent anime.
Blood+ Is an action horror anime like Shikabane Hime, but with a bit of mystery and more dramatic. If you liked Shikabane Hime you NEED to try Blood+!