The two on the left(brown and gold) are toms, Frogpelt(gold and black) and Pine, the two on the right are females, Crystal(silver girl) and Peach(cream she cat). Crystal is Exspectin Pines kits, Anemonestar is using the threat of hurting her to lug Pine and Peach into helping him. Peach is pines sister so shes helping him in the hopes she can charm Anemonestar into letting Crystal go.
but yer that's a basic bio of the other three he has more but I don't have any idea plans for there background yet.