Kayle is the first champion to have their abilities reworked 3 times since her release.
Kayle is the first champion to utilize their Chinese artwork in the NA, EUW and EUNE servers (zoomed in).
As stated several times in The Journal of Justice and some League Judgements, Kayle works as an investigator, match moderator and bodyguard for the League.
She often has had to intervene to save summoners and other champions from events gone wrong.
For a time Kayle's attribute list incorrectly said she was a tank.
Kayle shares a quote with Sion : "Lead me to battle"
Skins
Kayle's Classic splash art received some tweaks, scheduled for release on the Kha'Zix patch, due to the similarities of the rock formations in this art and the image of the Iona, Shield of Emeria card.
Silver Kayle is one of the four Collector's Edition skins, the other champions with this distinction are Alistar, Annie and Ryze. It can be obtained by buying the Retail Copy of the Collector's Edition.
The Chinese Classic Kayle art is used as the Tribunal image. Also, it is the same image that it is used on the page "The Tribunal", on the game start screen (or lobby).
Judgment Kayle was a free gift, given to those who played a certain number of games at the end of Season 1.
The skin is a reference to the comic book character Judge Dredd, most notably the shoulder plates.
Battleborn Kayle was first leaked in Brand's art spotlight in which it was originally named Gunmetal Kayle which can be seen here.
Aether Wing Kayle bears a strong resemblance to Uriel and other angels from the Darksiders series.
Her dance in this skin is Night of Fire by the Japanese band Dream. A side-by-side comparison can be seen here.
Relations
Morgana is Kayle's sister and seeks to defeat her.
Kayle had a part in subjugating Maokai when he accidentally came to life, she shielded the present crowd from the confused treant as he involuntarily unleashed blasts of arcane magic.