Anna is the Diana of the series, except instead of being a science officer and second in command of the fleet, Anna is the visitor liaison to the people of Earth. Unlike Diana, she doesn't wear a uniform, her job is more public relations oriented. In fact, rather than John being the first visitor that humanity sees, as in the original, it's Anna, whose face is projected onto the bottom of the visitor space ships.
Lisa is a guide aboard the visitor's mothership in NYC. She's basically the titillation for impressionable teenage boys. This of course is not unlike Brian in the original miniseries, who sleeps with Robin Maxwell. Does this mean that a lizard baby is on the way? I guess we shall see!
Described as a conflicted character, I strongly suspect this character will be a sort of cross between Willie and Martin.
In a way Erica Evans is like a cross between Mike Donovan and Juliet Parish. She's older than Julie, a mother to a teenage son, and she is a federal agent. She's one of the first people to start questioning the true intentions of the visitors.
Chad is the handsome news anchor who finds himself drawn to the visitor leader, Anna. Consider him the equivalent of Kristine Walsh, who finds herself drawn to Diana and in return for money and power becomes the visitor spokesperson, and what the resistance consider a collaborator.
Don't get your hopes up. This is no Ham Tyler. This Tyler is Erica's son. He's drawn to the visitor's Young Ambassador program, not dissimilar to the Visitor Youth camp which draws Daniel Bernstein in, in the original series.
It would be easy to say that Father Jack is just a younger, hotter version of Father Doyle from the Final Battle, who attempted to teach Diana about Christianity and is killed for it. But I have a feeling there'll be a little bit more to it than that.