Hasbro will be revisiting the mash-up concept in 2025 with Star Wars MixMashers. As you may recall, they previously had a line called Hero Mashers which are essentially the same as these new figures. Parts can be mixed and matched across various figures and lines (Marvel and Transformers). Here is the descriptive copy to explain it further:

Mix and mash characters from across the galaxy to create unique and customized figures! Collectible MixMashers Star Wars figures feature parts and pieces that pull apart and mash together to create uniquely customized figures. With 16 connection points, 5-inch-scale (12 cm) MixMashers Star Wars action figures feature universal connectors for compatibility and durability across the entire line. Want even more mashed-up creations? Collect included accessories and power-up parts to create and customize figures your way! Look for more MixMashers toys for kids to collect or give as gifts for birthdays and holidays! (Each sold separately. Subject to availability.)

So far there are 6 characters to collect (2 deluxe, 4 basic) which include:
– Darth Vader (Deluxe)
– The Mandalorian & Grogu (Deluxe)
– Stormtrooper
– Darth Maul
– Boba Fett
– Chewbacca

Click on through for a few images