While Fall Out Boy's previous single, "Young and Menace", was considered to be a major departure from their usual sound, "Champion" brought back some familiar elements from their more recent albums while still experimenting with new ideas.

Wentz made a post on his personal Instagram regarding the meaning of the song: "This one really reminds me of this moment in "the never-ending story" .

[1] The band first performed the song live on Late Night with Seth Meyers on July 26, 2017, to promote the album.

[8] At midnight on December 15, 2017, a remix featuring South Korean rapper RM of BTS was released worldwide across all major music streaming sites.

Billboard praised the collaboration, saying "...the remix offers up a grittier, hip-hop vibe thanks to a mellow tonal shift and RM’s evocative raps about the hardships of life.

It featured Wentz and rapper Post Malone skateboarding in a warehouse, along with the llamas that were seen in the music video for "Young and Menace".

American actor and rapper Jaden Smith ended the video by destroying the headset with a baseball bat.

[17] A note written by Wentz was posted to Fall Out Boy's official Twitter account along with a link to the video: "I can't think of a drug worse than fake reality .

[20] All tracks are written by Patrick Stump, Andy Hurley, Jesse Shatkin, Sia Furler, Joe Trohman, and Pete WentzAdapted from the liner notes of Mania.