- Mordekaiser might have been inspired by the , particularly Conquest.
- Mordekaiser used to be the only champion without any mobility or crowd control effects until V5.4 onwards ( gives him situational bonus movement speed).
- Mordekaiser's abilities reference / metal songs and/or bands:
- Mordekaiser is one of five champions who use their health as their spellcasting resource (the others being , , , and ).
- currently applies the longest damage over time in the game (10 seconds).
- 'Mordekaiser es #1 huehuehue' is the product of 'Brazil 5v5 tier list' by NA Summoner 'SKILLSHOT MASTER' and 'This is why we hate Mordekaiser' by 'McRooster'.
- Mordekaiser's helmet resembles the M in logo.
- Mordekaiser is voiced by .
- Pre-rework , , pre-fourth-rework and are also voiced by the same voice actor.
- Mordekaiser (German: "murder emperor") comes from Yun 'Stich' Lam's (Colt 'Ezreal' Hallam's girlfriend) online identity.
- Mordekaiser's title used to be 'the Master of Metal' and was going to be 'the Lord of Death' but after playerbase concerns it was replaced with 'the Iron Revenant' (suggested by NA Summoner Versaka).
- Mordekaiser's story references from and from .
- Mordekaiser's mace being called the eponymous song by .
references as well as
- Both it and a child's drawing of Mordekaiser (standing next to a burning house with 'I ♥ My Daddy' written at the top) can be seen in the game's Mac Version trailer.
- "Misery loves company" references:
- "No pain, no references !"No Pain no Gain by .
- "You only need to click once, fool!" implies for right-click movement and references a resetting each attack every time one Alt + Right-Clicks a target.
- "So be it... Summoner" references from ("So be it... Jedi")
- "Time to shred" references .
- "For great... torment!" resembles .
- Mordekaiser shares quotes with:
- The scene depicted has him using , , and all at once.
- He used to have an upward spike on his belt (might have been referencing from ) but was promptly removed for suggestiveness.
- He resembles from , from , the titular character from , and a from .
- Numero Uno (an indestructible guitar axe made of metal and made for metal) is replaced with
- His cape is replaced with flames.
- Mordekaiser embarked on a metal-fueled journey to recruit S|L], [S|L], [S|L], [S|L] and their backup singer [S|L] in order to form [Pentakill so they would and the whole of Runeterra with their music.
- He references .
- His S|L] and have [ resting on its back (was later changed to a taller throne due to concerns it resembled a ).
- He resembles from .
- This skin was reworked from a scrapped concept for S|L]. [
- He shares this theme with:
- Mordekaiser is building his strength in the Shadow Isles until he can lay waste to Noxus and reclaim the Immortal Bastion (his old fortress laying at the heart of Noxus Prime).