I can say that I would enjoy seeing Vivian again. I know the actress swore to never return after her last visit to Salem. Hopefully she changed her mind. She can bring her handsome son with her.
It would also be interesting to see Ernesto return. After the Cruise of Deception he was presumed dead (as was Hope). All the characters that survived his cruise from hell (Victor, Julie, Jennifer, Hope, John-at the time thought he was Roman) would be shocked to see him again. He was an evil villain.
Jan spears would be great to see back. Especially the actress portrayed her the second time around. She was so good at being bad. Honestly would not be interested in re-enactment of her obsession with Shawn Douglas. But if she were a rival of Chloe and/or Nicole, then that could be fun to watch.
I could see Kristen returning. Marlena needs more story. And if bringing back Kristen will mean some good Marlena scenes, I'm excited about that.
Anyone care to summarize who Orpheus was? I can vaguely remember him kidnapping Marlena? But fuzzy about details.