I can see Hondo making an appearance, but Ashoka seems a bit much. I think with a live action SW series they’ll probably try to make it more accessible to a broader audience, and suddenly having Ashoka appear would confuse most viewers I think. I think they’ve learned their lesson that EU characters like Saw Garrera is neutral enough to work for both casual viewers and fans, while something like bringing Darth Maul back will basically just confuse 90% of your audience. I’d also be surprised if there was any kind of Jedi, Sith, etc. at all in this series. Hondo, Hera and Sabine could work though.