At the time of ANH I think all the Inquisitors have also been killed off or missing I think. As far as I know there's no sign of them in any OT-era Disney EU at the moment. There are of course force users/former Jedi other than Luke like Ashoka, but they're mostly in hiding, or fairly obscure/hidden like the Knights of Ren and Sith Eternal (at that point).
Tarkin appears in Clone Wars where he works with the Jedi, including Anakin and Obi-Wan.