How they flap in the air like Lovecraftian manta rays swimming through the aether. Could be the next Pokemon Go, no? Collect all the panties and fight!
This would be better if it had zero human characters and a wider variety of underwear, like an axe-tossing Canadian pair of long johns, a Mormon temple garment that used magic spells, some gruff old granny panties unwashed since World War II, and a cocky jewelry-clad Italian speedo.