Zilean's concept may be inspired by the fictional personification of time, Šablóna:W, who is usually depicted as an elderly bearded man, dressed in a robe, carrying an hourglass or some other timekeeping device.
Zilean's back story is similar to the book Šablóna:W by Kurt Vonnegut, Junior.
The main character, Billy Pilgrim, discovers that he randomly jumps between different moments of his life, but is unable to change anything that has happened. He relives his life at random intervals from birth to death for all eternity.
Šablóna:Ai can cause a gamebreaking bug; if Šablóna:Ci with Šablóna:Ai buff on died, his passive would trigger immediately and then, once again after 4 seconds, dealing overall 1100 aoe true damage at lvl 18.
Zilean is the first champion to have a non-ultimate ability which can not be ranked up at level 1. The ability is Šablóna:Ai, Since Rewind can only be used to reduce other abilities cooldown, Making the spell useless if ranked at level 1.
Zilean was the first champion to be released after initial release.