If you want, tell us about the original Havoc Squad members (the ones who defected)?
Ask Me About SWTOR NPCs Thanks for the ask @jedimasterjaina !
Oh - I've got some stuff here, post KOTET.
For the record, Illaynah Antilles is my trooper in the Halcyon Legacy, so much of these head-canons involve her choices.
Harron Tavus status in the Republic is… complicated. He cooperated after his surrender, but its not like anyone will trust him. Saresh certainly didn't feel like bringing him back into the fold, especially not after Garza retired. He likes quietly on Coruscant in an apartment, closely monitored by the SIS.
Ryler Dorant - aka Needles - was killed by Illaynah and Jorgan on Taris. Eckard Lokin later retrieved most of his rakghoul research, which doesn't make anyone nervous.
Vanto Bazren - aka Fuse - helped Illaynah on Tatooine, saving lives. After his surrender, he became a trainer and analyst on demolitions, though his security clearance and field certification aren't restored. He doesn't regret returning to the Republic, but his life was rather boring. Years later, the Alliance - at Illaynah's request - would negotiate for him to be allowed to transfer to the Alliance. Fuse ultimately joins the new Havoc Squad, effectively taking Tanno Vik's place. The latest iteration of the Squad usually only takes special missions.
Bex Kolos - aka Gearbox - was killed on Alderaan. The Empire (and the Republic) would both eventually conclude that his Plan B walker was impractical for mass production.
Zora - aka Wraith - … actually survived the confrontation with Illaynah on the Justice. (This is canon-divergent.) What Garza did to her afterwards… well. That may be a story for another day.
Thanks again for the asks!