The Fel clan was a major part of the original SW EU. Baron Fel was introduced in the X-wing comic series, which was a prequel to the novels; he was a Correlian pilot who helped train Han Solo and several other Rebels during their Imperial academy days, but later became a major ace. He largely avoided the main battles of the OT, but managed to score several morale-building victories instead (Such as destroying a Rebel base on the same day as Yavin, and wiping out a convoy to Hoth-the same defeat which opened the Radio play and gets Luke promoted to commander of Rogue Squadron due to Fel killing the other commander).
After Endor he's assigned to other things, but doesn't like the corrupt leadership of Isard and Sate Pestage. He is captured by the Rebels.
However turns out he's actually Wedge's brother-in-law as he married Wedge's sister who is a holo-star (Also something Isard holds over his head)
Fel joins Rogue Squadron in part to help protect his wife and family as they go into hiding but soon vanishes.
He re-emerges later as a follower of Thrawn and guest of the Chiss who kept his family safe from Isard's retribution, and starting a massive family with Wynssa.
His son, Jagged becomes a major character in the NJO and the following novels, with a romance and eventual marriage to Jaina Solo, Han and Leia's daughter. This in turn leads to the Fel Dynasty and a reformed Empire, which kind of eventually splits into pro-Fel and pro-Sith factions decades later.
https://starwars.fandom.com/wiki/Soontir_Fel/Legends
He's still canon but only in the "ace pilot" stuff for one of the tabletop games.
https://starwars.fandom.com/wiki/Soontir_Fel
Now obviously the Jaina stuff isn't going to work but could some version of Fel still work in Disney's canon (More so than this of course) like Thrawn?