Yeah, I would love for my characters to eventually meet up with your characters at some point.
Elsword (Who as a Lord Knight like he is in the RP, isn't as much of a hot-headed idiot as he was before becoming a Lord Knight. As a Lord Knight Elsword became FAR more serious than being a blunt, hot-headed character) would make for an interesting interaction with perhaps Renamon or Nera.
Raven with his rather grim past (losing everyone he once held dear to him [fellow Crow Mercenaries, his friends, and Fiance] because the Royal Guards of the Kingdom of Velder grew jealous of Raven's high status as a "commoner" [Raven at the time was became the leader of the Crow Mercenaries, the group that he was apart of alongside his fiance Seris], framed him and locked him away in prison, his fellow mercenaries saved him from Prison then they escaped to the outskirts of which the Royal Guards hunted them down and killed everyone [save for Raven who would have died, if not for a Nasod being who offered him power. In turn he was brainwashed into working for the Nasod Race before being brought to his senses thanks to Elsword]) would probably either get along quite well with Nera, maybe Renamon. That or he might not even give a damn. Though the Beast Duo (hell maybe even Midna if he meets her) could probably help him find some solace about his past. Judging by how Nera if I recall had a similar incident happen to her with her village (I can't remember. I know she wasn't blamed by Royal Guards, then was sent to prison etc.)
Chung no clue on.
Rena she would get along with them quite well with how friendly and happy-go-lucky she is. In fact she could even be a bit of a motherly figure for the Elsword group.
Ara could possibly get along with Nera and Renamon. Midna she might be scared of at first.
Elesis (Elsword's elder sister) would enjoy talking with Renamon, maybe Nera. Don't know about Mara.
Aisha would also probably get along quite well.
Eve... honestly... I have no clue on...
Then there is my new fav, Add. Who has an equally depressing past similar to Raven, and Chung. Though might be a bit more depressing with what happened to him...
Also here is something for you guys! A video telling all the Lore of Elsword! Rather informative I must say.
https://www.youtube.com/watch?v=qFAEECXm6y4