Hello, right now I’m rigging an exemplary walking cycle with MakeHuman.
This program is open, free, small, easy and I simply love it 
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You don't need to have any particualr graphical skills in order to use it, just a feeling for what pose looks natural.
If you would like to help me creating animations with MH, then please drop a note.
Various 3d models for stuff like armor, etc. are of equal importance.
(The format is not so important, as long as it can be imported into Blender.) They don’t have to be perfect, just capable of development.
And we will need textures (.png preferred) for the various places in Sigil, floors and walls in particular.
Ah, sketches would be great, too.
Looks like “anything goes”. 
I don't know what formats blender takes. Do you have a list?