- Darius was designed by CertainlyT.
- He was in production long before the Journal of Justice Issue was released with a character of similar looks. 
- Darius is voiced by Chuck Kourouklis.
- Darius' name derives from the Persian word "dariush", which means "kingly".
- Darius was the name of a Persian king who was also called "Darius the Great".
- Darius is the first champion to have a special animation while using Recall or Teleport in which he lifts his axe upward and looks up.
- Darius and his brother are the first related champions to be released back to back. Coincidentally, they both have the same level of attack speed to indicate their brotherhood.
- Darius is one of the 8 champions who do not have a single skill that scales off ability power; along with , , , , , and .
- His Axe is just a Noxian-forged battle axe.
- When Darius crits, he takes a large swing at his target's neck.
- He doesn't really care for title or privilege - he just believes in using his power in the service of Noxus 
- Darius is not a crazed, bloodthirsty maniac, contradicting what people would believe. He's more of a cold-blooded killer, moving through the battlefield with powerful, but precise, movements, striking with deadly force where it matters most. He takes pride in combat, but there's no primal bloodlust that he constantly needs to sate. Unpredictable sadists don't always make the best commanders .
- When his ultimate, Noxian Guillotine, is used, the model of his classic skin will change to be spattered with blood.
- Darius' Noxian Guillotine is referred to as "Sudden Death" within the game's files.
- Darius' Crippling Strike is referred to as "Hamstring" or "Noxian Tactics" in some cases within the game's files.
- There used to be a buff icon when Darius' movement speed was increased through Hemorrhage, with the following text: "Aggression - The carnage of war enlivens Darius, increasing his movement speed."
- Both of Darius' jokes have him trying to spin while shouting "Noxus!" as a reference to and the popular "Spin-To-Win" joke. However, Darius has difficulty performing the move and, in one of said jokes, wonders how Garen does it.
- Darius shares a quote with . "Stay alert."
- He shares a quote with : "Get dunked"!
- He has two similar taunts with and : "Spooky".
- He shares a quote with and : "Too easy".
- Many of his quotes have the word "Dunk" in it.
- All of his quotes when he is buying items have an advertisement twist.
- His joke: "Nothing but dunk", is a direct reference to Michael Jordan's Big Mac advertisement.
- Noxus Air is a reference to Nike Air shoes, ones that many basketball players wear.
- It currently has the most taunts ingame.
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- In his splash art, Beatrice ( raven) appears in the battlefield.
- In Darius' classic splash art, a shadowy figure can be seen who resembles .
- Though this can also be a regular Noxian soldier, as the ones illustrated in the Journal of Justice look very similar to the figure.
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- This skin gives off a green glow whenever he uses an ability.
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- In the splash art, Darius can be seen fighting Frost serpents, feared beasts originating from Lokfar and who are mentioned in lore.
- He bears a striking resemblance to Norse King Darius". as from . It was formerly known as"
- He shares this theme with Woad Ashe and Woad Scout Quinn.
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- This skin was a fan suggested skin and is inspired by numerous memes that portray Noxian Guillotine as a Basketball dunk.
- This skin refers to the job that Darus might have had, similar to Primetime Draven.
- On the back of shirt, a symbol of axe can be seen.
- Many of his animations are influenced by famous basketball moves.
- In his walking animations, Darius dribbles a basketball.
- When he ults and Recalls Darius does a Michael Jordan slamdunk.
- Darius has formed an alliance with
, seeing him as a leader with the mind and determination to bring Noxus to glory. With Swain, Darius works to unite the nation behind his vision of true Noxian strength.
- Darius's view of Swain is almost entirely pragmatic. He will loyally follow Swain's orders, but it's more chain-of-command than father-son relationship.
- Darius is somewhat suspicious of the Black Rose. He understands that they've used deception and trickery to help in Swain's rise, but he's concerned that he doesn't know the depths of their conspiracies.
- Darius doesn't have much respect for  : if one died in battle, they didn't deserve to survive.
- He has no personal issues with . - he thinks the man is a fool, following a meaningless code of "honor", but he doesn't have a burning hatred for him. He would relish killing Garen in battle though, proving Noxian strength triumphs over the most iconic image of Demacian values
- Darius is
older brother. The two together were known as "The Blood Brothers".
- Family bonds can be strong, and a family can become a foundation of strength. It can become easy for weak people to use their family name as a crutch, though, resulting in the kind of self-serving aristocracy that Darius sought to topple. It's clear that Darius felt a responsibility to keep his brother safe and alive - whether that was from love or pragmatism remains to be seen.