Two character posters promoting 9 are online, along with a few words from producer Tim Burton, courtesy of bscreview.com.
The first is of 7, voiced by Jennifer Connelly:
"A brave and self-sufficient warrior, 7 is the group’s sole female. A fiercely independent adventuress, she has been out patrolling the wasteland. To survive, she has adapted, finding the bones of a deceased bird and crafting her signature skull helmet.
"Producer Tim Burton explains why he loves 7: '7 is my favorite in terms of poses struck. Growing up on martial arts movies, 7’s got that real Bruce Lee kind of quality that is just really strong."
And 8, played by Fred Tatasciore:
"Armed with a giant kitchen cleaver and half a scissor blade, the none-too-bright muscle and enforcer of the group, 8, is created to help the others physically survive the dangerous, post-apocalyptic world."