He's got those little chicken wings simply because you have that part of the model weighted to the wrong bone. Try playing around with the bone's influence. As for the cloaks, they can be pretty tricky to get them to deform or animate smoothly. A good think to remember is that one vert or point can be weighted up to 4 different bones in JKA. So, if the maximum effect you can have on a vert is 1.0, you should try to split it up to make in run smoothly. For example, you can do 0.25 to rfemur, 0.25 to lfemur, and then 0.50 to pelvis, which would still ultimately up to 1.0. Sadly there's no one right way to rig something, so you really have to just play around with it.