User blog comment:IE2555/A discovery on the Official Website.../@comment-1695916-20140214015207

The rival and "friend" thing on each of the champ's profiles has been known for a while now. You are just one of the few who created a post about it.

Elise was once a member of the black rose, hence the purple skin like Leblanc.

In Quinn's lore, she has had some encounters with noxian assassins. Hence talon.

Ahri and Wukong both came from the forest of Ionia. Perhaps, they've met each other long before.

Zed and Syndra may not be friends but have similar goals, relating to the bleak future of Ionia.