General
- Kassadin's breathing might be referencing Darth Vader's from Star Wars.
- Kassadin has been disabled for every Ultra Rapid Fire edition (most likely because he would be able to
Riftwalk the entirety of Summoner's Rift in seconds). - His name superficially resembles Arabic Qass ad-Dīn الدين قَسّ, literally "priest-of the religion"; however it's unknown if Riots have intended that specific meaning.
Skins
- He resembles Emperor Zurg from Toy Story and a Helghast Trooper from Killzone.
- He celebrates the 2010 Winter Olympics.
- He was conceived by NA Summoner 'Ser Gregor'.
- He references the the eponymous entities from the Cthulhu Mythos by H. P. Lovecraft.
- This is him before being transformed by the Void (meaning he is deep within Icathia)
- The tentacles grabbing him might be referencing
Vel'Koz's species.
- This is him having been convinced by and having joined forces with Malzahar in ushering the Voidborn into Runeterra.
- He celebrates the Oceania server's launch (all revenue from the server immediately after release was donated to charity for medical services and research)
- His Nether Blade becomes the Crux.
- He resembles Number 39: Utopia from Yu-Gi-Oh!
- He shares this theme with Cosmic Blade Master Yi, Cosmic Dawn Rakan, and Cosmic Dusk Xayah.
Relations
- Even though he is from Shurima, his ties to his homecountry are very weak, due to his preoccupation with the void.
- Kassadin is on a mission to save his daughter from the void, and stop it from spreading across Runeterra and to keep the veil separating both planes from shattering completely.
- Kassadin and Malzahar are polar opposites. While Kassadin tries to fight the void, Malzahar tries to bring it to Runeterra. Malzahar tried several times to recruit Kassadin, to no avail. Malzahar is also responsible for sending Kassadin's daughter to the void.