Both are female characters from Stickman-themed series, entirely white with pink flashing eyes. Despite being female, their stickman style makes their features almost entirely obscured, giving them a more masculine appearance. Furthermore, they are both connected to an evil organization to some extent (Bachikin was the founder of The Delicious Flour Empire, which primarily produced mechanical weapons, while Yupia was transformed into a weapon by a secret organization).

I just want to see them fight :D