Zilean's concept may be inspired by the fictional personification of time, Father Time, who is usually depicted as an elderly bearded man, dressed in a robe, carrying an hourglass or some other timekeeping device.
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.
When Zilean is in a match where an enemy Volibear is present, he gets an icon called Armored Bear Hater.
This icon reads: "In my day, we would never have allowed an armored bear into the League of Legends."
Volibear also gains an icon when Zilean is in the opposing team. Allied Volibear is unaffected.
Additionally, if the enemy Volibear kills Zilean, he will remark "I have a special claw for you, Zilean" or "Your time has come, Chronokeeper."
This is a reference to Zileas, who was against the possibility of Armored Bears on the forums.
Zilean's Time Warp has the longest duration of any crowd control effect in the game at 5.5 seconds. Followed by Nasus Wither which is 5 seconds.
Chrono Shift can cause a gamebreaking bug; if Kog'Maw with Chrono Shift 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 Rewind, Since Rewind can only be used to reduce other abilities cooldown, Making the spell useless if ranked at level 1.