The one at the left top corner is Sorscha Jordan. Named her after the book character from Tog
The one below her is her older sister Vivian Torres
The one below Vivian is Sorscha's twin Erin Jordan
At the right top corner is Natasha Jones
The one below her is Bree Jones (older)
The one below Bree is Vivian's twin Karson Torres.
Each pair of twins have different last names since each pair has different dads.