Shadow– shady kind of guy, maybe a spy. [like the rhyme? :P]
Arrow– sharpshooter.
Two-Face– had accident (fire?)–half of face is burned /or\ was a thief/criminal already, and scammed people [like Camon in Mistborn], so he did a lot of disguised work
Leaf-Burner (or just Burner)– was an arsonist before; fascination with fires. (maybe there was a story, like the clan found him [I don't know if this would work with your story] because he was burning leaves in the forest and they saw the light, so they took him)
Bull– really big guy (strong), kind of like one big muscle.
That's all I have for now. If you want, more will come later on.