- Sion was designed by Colt 'Ezreal' Hallam.
- Sions VU promo page was leaked on the Korean LoL site before its intended release on all the servers, here is the text in Korean.
- Old Sion was voiced by J.S. Gilbert, Who also voices 20px Battlecast Prime Cho'Gath, , and .
- Classic Sion is voiced by Scott McNeil, who also voices and .
- Sion's old dance is reminiscent of "Moskau" by Dschinghis Khan. A side-by-side comparison can be seen here
- Sion was one of the first six characters designed, along with   , , , and
- Sion was one of the champions available for the Noxian pool during the Ionia vs. Noxus match, and was one of the selected champions.
- Feel No Pain was possibly taken from the table top game, where it is a special rule that gives units a chance to ignore wounds.
- Sion is one of four champions that can, in theory, infinitely increase a stat by using an ability. Sion can continuously increase his maximum health with his Enrage. The other three are Nasus, Thresh and Veigar.
- Sion's quote, "I must brake you.", is a reference to the movie.
- Sion's quote that he says to , "So, uh, Urgot. We can't hang out any more. I'm cool now." is a reference to Sion's old model, where he and Urgot were one of the most ugliest champions.
- Sion shares a similar quote with : "Even death trembles before me."; where as Veigar says: "Even death trembles in my presence."
- Sion's quote, "I'll be back." is a reference to the movie.
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- Sion's old character model shown him wielding a double-bladed axe, as he does in his Warmonger and Barbarian skins, rather than the classic single-bladed axe that appeared in both of his classic skin artworks.
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- It is a reference to the franchise.
- Hextech Sion's robotic eye is on the right of the original artwork, but on the left in the Chinese artwork and the new model.
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- It is a reference to the character .
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- This skin could be a reference to Paul Bunyan, with Unchained Alistar as the reference to Babe, the Blue Ox.
- It may also be a reference to Mark Kaminsky - character from movie , played by Arnold Schwarzenegger.
- The Black Rose, though soon after they returned him back to his tomb for fear of his monstrous nature. Darkwill then onwards ordered no one without his approval to come near the tomb which may have influenced The Black Rose to assassinate him later.
was once a supporter of Boram Darkwill, previous Grand General of Noxus. Once he was killed at the fortress at Andras, he was resurrected with the help of
- Sion was recently resurrected again by the help of , the current Grand General of Noxus.
- , and all had their part in the rebirth of Sion. Leblanc and Swain ordered the resurrection process and Vladimir performed the ritual.
- blood was used for the second resurrection, hinting that for the ritual to fully be realized, a special blood price must be made. In this situation it was the blood of the descendant who initially killed Sion, a Lightshield.