So the green frog costume is courtesy of my sister, but I made the other two. Lincoln drew a picture of what he wanted to be so if you're not sure, he's a red monster. Isaac is Ang, the avatar. If you're not sure who that is, well, I'm disappointed, but you can just google him and you'll see how awesome of a likeness I brewed up. :)
Also, Isaac is coughing in most pictures because he has pneumonia.