As a sister post to the one about map resources, this one is about supers-themed minis (which again, amounts to just about everything but fantasy themes, because fantasy minis are everywhere).
Pre-made minis: Superhero Miniature Resources – (Re)Turning (to) the Tables (drl2.com)
3d printables: 3d Printed Superhero Minis – (Re)Turning (to) the Tables (drl2.com)
Please let me know if there are others I've missed!
MP Character Generator: https://mpgen.drl2.com
My gaming blog: https://gaming.drl2.com