Amaya kind of feels like she could go either way to me. She does have a set history, but with the Spear they have a way around that. Or alternatively the Legends can remove her from history right as she's supposed to die. They just don't seem to have done as much with the character as they did Nate. If Amaya is gone, that only leaves one black character left so I feel Jax would be safe. They did get rid of the other two black actors last year.
Rip feels like a character without a place on the team at the moment. He is a huge part of why the series worked for the first season, but now that they're self sufficient he seems like dead weight compared to Sara. He'd be much better in a recurring capacity. And as we say last season with the Hawks, this show isn't afraid to jettison characters that aren't working. I'm sure Arthur Darvill would be amenable to doing less episodes, the producers worked around his schedule this year. They'll never bring in Booster Gold who would be a great story for Rip.
Of the series regulars:
Ray, Sara, Stein, Jax = safe
Nate, Amaya, Rip = toss up
Mick = loves the 70s
Eobard = beaten, not dead