If you're printing directly with the STLs, you will need to print: (No supports required, except where noted)

2x arm-upper-arm.stl
2x arm-lower-arm.stl
2x arm-hand.stl
2x leg-foot.stl (requires bed-only support)
2x leg-calf.stl
2x leg-thigh.stl
2x body-torso-half.stl
4x body-pelvis-shoulder.stl
1x body-neck.stl
50x connector-pin.stl
1x head-skull-top-separate.stl (requires support everywhere)

1x head-skull-bottom-separate.stl (requires bed-only support)
1x head-right-eye-separate.stl (optional, requires bed-only support)
1x head-left-eye-separate.stl(optional, requires bed-only support)
1x head-nose-separate.stl(optional, requires bed-only support)
1x head-mouth-separate.stl(optional, requires bed-only support)

The biggest purpose of the pins is to align parts when you glue them together. For this to work, the pins need to press fit into their respective holes. Before printing all the pins, check that they press fit! If not, scale the width and height up or down as needed to fit the holes. Don't scale the length, or your pieces might not sit flush together.

I recommend printing on a smooth bed. This will make for better seams when gluing together the body and arms.

This is not a functional, structural part, so you can get away with sparse print settings to save time and filament. I printed mine in PLA with 7% infill, 2 perimeters, and 0.2 mm layer height.