Hi! Hannah here, and we've already discussed our mutual love for Special Agent Grant Ward. Octavia will be working as a junior agent, so they'll probably see one another around although I'm not sure exactly how she'll feel about him if she ever happened to hear about his past. But if she doesn't know about his past then I think they'd get along pretty great. I think he could remind her of her brother a bit.
And obviously Abe will be thrilled to see his favorite alchemist around. He'll probably try to adopt Declan as his grandchild since he's going to be getting prepared to have an actual grandchild lol.
For Tenel Ka - I know Star Wars but only by the movies, so I'm familiar with the world but not the actual canon she comes from.