- Sejuani was the first champion released in 2012.
- Sejuani was first announced by Ezreal in one of his posts.
- Sejuani's title was formerly "The Winter's Claw," but has since been changed to "The Winter's Wrath."
- Sejuani is likely the anticipated female boar-themed champion, though many thought that the boar would be the champion herself rather than being the mount of the champion.
- Sejuani's boar is named Bristle.
- Riot employees jokingly calls Bristle as Kevin Tuggles.
- In Sejuani's Art spotlight, the artist names the layer that has the boar on it "Piggles". Screen capture of it.
- Regarding the Ranca_Golden_Hour speculation, this screencap, from the Art Spotlight at around 5:17 for a split second, it can be seen that Ranca_Golden_Hour.jpg is in fact just a reference image. Google Imaging Ranca Golden Hour will also give this image as the first result.
- "Winter is coming" is a reference to the motto of House Stark from the A Song of Fire and Ice book series and the popular HBO program adaptation. It has also become a popular meme.
- According to the Journal of Justice, Sejuani is in direct conflict with Ashe, opposing Ashe's claim as the Queen of Freljord.
- Sejuani is distantly related to Ashe as they both descended from two of the three legendary princesses, who were sisters to one another.