* If not Hedala personally, some Force-sensitive youngsters hunted by the Empire who Ahsoka has come to protect, as she did in the novel, Rebels and Clone Wars, which may even serve as a minor link with the Obi-Wan show given that it already is with the Fifth Brother.
* Fulcrum recruiting Hera (not really mentioned anywhere, just my first thought when she told Bail she wouldn't recruit people and wanted to run his intelligence network instead).
* I guess Kaeden would be too much fan service and/or small universe syndrome depending on when, but... Given that Ahsoka has not had a personal life in none of the series, I would appreciate something of that nature.