Raven and Utsuho actually makes sense, not just due to their abilities and that he is named after the kind of bird Utsuho is, but also by the fact that they are almost opposite in personality. Utsuho is a bit more outgoing, and friendly and is a bit of a clutz. On the other hand Raven takes things seriously, isn't as outgoing, but does care for those he is close for. Opposites attract after all (now I really want to see this relationship happen.) Hell Utsuho might even be able to cheer up Raven. I also plan on Raven's personality to change slightly after his training. After his training he will be a bit more quiet, and reserved. He will also be a bit more serious (even more so than he already is.) Utsuho if they ever do meet and end up becoming friends I imagine that Utsuho would remind Raven a bit of Elsword (the character not the game itself.) In turn Utsuho might be able to get Raven to open up a bit once more.
Chung on the other hand... yea I agree. He may be 16, and I don't think he would even consider a relationship until he is older.
Also everyone's "Dawwwww" will probably turn into an "AAAAAAAAHHHHHHHHHHHHHHHHHHHH!!!" When they see him firing his Destroyer (most notably his ultimate move Satellite Rain.)
Then again...

Chibi Chung: "I'll destroy you with cuteness!"
Everyone: "Dawwwww..."
Chibi Chung: "Fires a large blast from his Destroyer, completely destroying a house right next to where John is standing in one single shot.*



*slowly backs away* "I was just walking with her... nothing special..." *continues to walk away slowly.*