Zilean especially, Jax had a tidbit of lore with Where Icathia Once Stood, which pretty much made clearer things we have always known except for a few details like his full name, position in the Icathian political system, his personal relationship with Colgrim and that he killed an ascended. These were minor bits of info in the text.
His colour story is... Questionable.
Zilean on the other hand has *nothing*. And Icathia was considered the best short story of the year by the boards, so yeah!!