Axel Brodie is a friend of Jaden Yuki and a main protagonist in Super Smash Bros. Crossover starting with his debut in Season 20. While Axel didn't appear in Season 16, a duplicate of his Duel Disk was in the possession of 4Kids, until it was stolen by Link.
- Axel is the third Yu-Gi-Oh! GX that didn't appear in a season, but was referenced by a possession of his. The first two were Zane Truesdale and Jesse Anderson.