This is a beautiful piece, graceful and poetic. Thanks for writing this

So, you got Raven's dead fiancé being Seris and Rena ressembling said dead fiancé right, which makes me guess, that this is a work, that should be somewhat close to canon. That being said, you were very sloppy with how he sees the El Gang:

Raven would not call Elsword "red headed brat". That's something, Aisha would do. Raven could make remarks on how Elsword is hot-headed, but he actually has no problem with him at all and also respects him.
He does however hold a (tiny/little/whatever the size may be) grudge against Eve for being a Nasod, respecting her as a member of the party only because Elsword declared his friendship with her this early, which on the other hand was also her motivation to join. Although seen as "the cold but maybe actually friendly Nasod" by anyone else, Raven sees her more like "the girl, which only fits into our group due to Elsword."
Raven would talk about Aras clumsiness rather than her "mission". It's the same with Chung. Why does he describe the others characteristics only but Chung and Ara only get recognized for what they want to do?
I doubt, that he would realize Adds "crazed geniusness". He would rather state, that he doesn't want him to look at his arm.
How common are pairs of demons and half-demons held by contract? Seems pretty usual in this story.