(NPC asks) What happened to Watcher One and Attros Finn?
Ask Me About SWTOR NPCs Thanks for this ask, @the-raven-of-highever !
Watcher One survives to the "present day" of my Halcyon Legacy, and has even contacted Corellan a couple of times over the years via secure dropboxes, including after the formation of the Alliance. He even helped Corellan on a situation once. (More on that another time.)
Attros Finn remains active as well. The Jedi doctor was forced to go underground during the Eternal Empire's subjugation of the galaxy, joining a number of other Jedi who didn't retreat to Ossus in aiding the Republic from the shadows while hiding in the slums.
(I call them the "Shadow Enclave", and it includes several other canon NPCs from the game, including Unaw Aharo.)
They later make contact both with Corellan's Alliance and with the Ossus Colony. Attros doesn't join either, albeit he's on good relations with both.
Thanks for the ask!