Years before the debut of Kylo Ren, a Sith Lord from Star Wars Legends demonstrated the futility of idolizing Darth Vader. In the original Star Wars Legends timeline, the Sith Lords of Darth Banes lineage died with Emperor Palpatine, but they were succeeded by new iterations of the Sith Order specifically Lumiyas Sith and the One Sith. Following the Star Wars franchises reboot in 2014, the Sith Orders history was reimagined, though both timelines include at least one dark side user with an unhealthy obsession with the late Darth Vader.

https://screenrant.com/star-wars-darth-azard-kylo-ren-vader-obsession/