For Xena I'd cast Ingrid Oliver
If she can do a good American accent then go for it.
For Ares I want Tom Ellis. Here he is as basically the same character in Merlin, a big, cocky, egotistical guy who dresses in leather and fights with a crazy blonde.
https://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=0ahUKEwi2obPm7KrNAhXH6RQKHXYmCVoQjBwIBA&url=http%3A%2F%2Fvignette4.wikia.nocookie.net%2Fmerlin1%2Fimages%2F0%2F04%2FCenred22.jpg%2Frevision%2Flatest%3Fcb%3D20120313211951&psig=AFQjCNFfeM-u_thAFvWKogbxbbre_YC1hA&ust=1466108085716981
Alti I would cast Jill Wagner. She played a mad evil bitch called Kate Argent in Teen Wolf. She's a great villain and she's got the evil, sexy MILF that you want to get tortured by thing going on like Claire Stansfield.
https://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwji7_-Y7arNAhWIzxQKHQ9sDXAQjBwIBA&url=http%3A%2F%2Fvignette1.wikia.nocookie.net%2Fthe-teen-wolf%2Fimages%2Fb%2Fb2%2FKate_Argent.png%2Frevision%2Flatest%3Fcb%3D20140408025011&bvm=bv.124272578,d.d24&psig=AFQjCNH-cwAwMqyPE5P02GhSPf_cjtBO_g&ust=1466108248695937
I am not sure about the others.

Gina Varela is a Greek Kiwi actress. She has done TV shows, feature films. Her acting debut was in the Xena episode "Whose Gurkhan?" as the slave Milda. I think it would make sense casting a genuine Greek actress in the role. Because Xena is from ancient Greece.

Maybe we need a fresh face for Xena, instead of someone whom is well known. I think I may know who - Gina Varela.

Britt Robertson as Gabrielle. She looks more than a little like her, but more importantly, she has many of Renee O'Connor's mannerisms. It's not as apparent in her movies, but I recently watched her short-lived TV series, The Secret Circle and it was uncanny.
"You crazy witch!" Phoebe Halliwell, Charmed.

I saw a recent photo of James Franco and thought he would be perfect as Ares, doubt he would take on the role though

I'd like to see how Gina Torres does as Xena, and I agree with whoever said Jolie as Alti. I'd like to see Robert Treber again as Salmoneous.

Joey Lawrence for Ares

I think they should search for the cast based on the chemistry of the actors and their abilities, not based on their resemblance to original cast members. Ideally, the cast will look different from the original series cast.
I have to agree with this. The Xena Reboot should have different interpretations of the characters to not just be channeling the original cast.
The lion doesn't concern himself with the opinions of sheep.

I think they should search for the cast based on the chemistry of the actors and their abilities, not based on their resemblance to original cast members. Ideally, the cast will look different from the original series cast.

This message has been deleted.

I was actually thinking Adrienne Palicki too, she's a versatile actress and might be able to pull it off.

Jaimie Alexander
was my first choice for Xena but alas she got another show.so depending on how long she goes on SHIELD,
Adrianne Palicki
is my next choice ..if not, 3rd option is
Mandy Moore
and if not, then my LAST option is
Jessica De Gouw
.
Personally no preference for Gabby yet, but if they go for a unknown actress, I would pick
Anna Hutchison
.
For Ares, its hard to out do Kevin Smith, but per looks alone and similar acting, I'd pick
Matt Nable
.
Most people call me a pessimist, I prefer to be called a realist.

Actually yes they look like a great cast list definitely Dakota fanning
Love her

Although I agree that Jessica Lowndes is incredibly beautiful, I don't see her as a warrior type. She's dainty. Instead, I can picture her 90210 co-star Jessica Stroup. She stands at 5'8" and I can see her yielding a chakram and/or sword.

Yea, you may want to think smaller Nike. There is no way in hell those names would sign on.
For Xena and Gabby, I'm not sure whether I should go with looks or acting skills. If producers are just looking for an attractive chick to kick ass, they could choose Jessica Lowndes. She's very attractive, fit and looks like Xena somewhat. I actually CAN picture Dakota as Gabby.

I was waiting on someone to make this post.
My ideal cast:
Meg- Emma Stone,
http://images.tvrage.com/screencaps/34/6668/236256.jpg
(ctrl +),
http://www.taaz.com/images/B3284EEC601889A2CAC5512DE9A1FE29.jpg
Hope- Dakota Fanning,
http://vignette2.wikia.nocookie.net/hercxena/images/9/9c/Hope_Xena.jpg/revision/latest?cb=20091011010216
,
http://wallpup.com/wp-content/uploads/2013/04/Dakota-Fanning-Twilight-Wallpaper-HD.jpg
,
https://jacksonupperco.files.wordpress.com/2013/12/an1_013.jpg
Alti- Angelina Jolie,
http://33.media.tumblr.com/tumblr_lsjb36vpjv1qdku85o1_250.gif
,
http://majorspoilers.com/wp-content/uploads/2014/03/Malfcnt_Payoff_F.jpg
Julius Caesar- Craig Horner,
http://vignette3.wikia.nocookie.net/hercxena/images/4/4e/Caesarfates.jpg/revision/latest?cb=20091223145210
,
https://s-media-cache-ak0.pinimg.com/236x/bb/5b/78/bb5b789bdf35b6b5a8885a8dc5207230.jpg
My cast has too much star power, and lacks the main roles, I know. I didn't have any luck choosing their replacements.