They were all connected to the comics, some more than others. Abraham’s group was pretty much lifted directly from the page. Bob has the same name as an Army medic from the books, but that’s about all they have in common. Tara has an equally small number of similarities to the Tara Chalmers in the graphic novel; TV Tara is pretty much her own woman. (Gareth may be a TV adaptation of Chris, leader of The Hunters, but we’ll have to see.)
Season 5 is now filming, and on set photos have shown new series regular Seth Gilliam dressed as a priest, which sounds like a pretty clear hint to his introduction as Father Gabriel Stokes, a character from the comics. We’ll have to see how that character is remixed for TV, but The Hollywood Reporter asked comic book writer/TV producer Robert Kirkman if other familiar characters might be introduced in S5.
“I wouldn't be surprised to see some more announcements along those lines at some point soon,” RK said. “But that's always the case. We're always going to be cycling through characters, as I like to say in an ominous and foreboding kind of way. If we're not bringing new blood into the mix then we'll eventually run out. So we're definitely going to be bringing some new blood into the mix and always moving forward.”
On a similar note, AMC just caught up with The Walking Dead producer Jolly Dale, and she talked about some exciting things ahead in Season 5. “There’s a lot of stuff I’m not allowed to talk about, but readers of the comic book will have a pretty good idea of which direction we’re going in. The way I see it is, we’ve killed a lot of beloved characters on the show, but that just opens it up for new storylines to come along. So don’t be too sad about all the people who died in Season 4 because there will be way more characters to come.”