Simple, in many ways, stackable people.

I CNC this (with my little helper) from 20mm thick balsa wood. You can make 10 pieces out of a 10cm x 100cm balsa plank.

Super light, but strong.

You can of course also easily extrude this and 3D print it, might only take much longer then CNC

Used a 25mm long 3mm router bit.

Wood: Balsa Wood 10x100cmx2cm