Rather notoriously, major Yu-Gi-Oh! characters ... across Duel Academy. Bastion is briefly in Season 3, but this is effectively the end to his story, and he doesn't appear at all in Season 4.

From Yugi Muto to Jack Atlas, there are an abundance of major Yu-Gi-Oh!characters fans ... of the actually important characters actively forgetting he exists. By Season 3, Bastion doesn't duel once, ...