don't get a batman cape. what you want is a dracula cape, it has the exact same shape and should be easier to modify if needed
something like this
I look forward to this and may even help contribute if i can. i have a friend that i am going to help work on a black panther build as well. (going for what it might look like in the marvel movie universe)
That panther head for the spear would look amazing with an acetone bath Giving 3D printed parts a shiny smooth finish