LeCoultre Serpentine leads the Topless organization alongside her twin sister, Piaget Serpentine, as the Serpentine Sisters. Commanding significant respect, they operate as a "two for one" entity, requiring their combined presence to fully manifest their exotic Topless abilities. Both sisters pilot the unique Buster Machine 42 (Quarante-Deux), a mecha with a gorilla-like facial design capable of splitting into two smaller units. They preside over a secretive circle spanning military and political spheres, engaging in dubious activities. Their primary motivation is extending the duration of Topless powers, which naturally diminish with age. This drives them to initiate a plan to awaken an "eternal Topless," believing this entity could permanently eradicate the space monster threat and preserve Topless abilities indefinitely. However, this entity is an exceptionally powerful space monster. Their attempt to awaken it escalates the conflict with the space monsters and inadvertently catalyzes Nono's awakening as Buster Machine 7. The consequences of their actions play a significant role in the narrative's progression toward its climactic battles.