Niō are the wrathful guardians in Buddhism. Guhyapāda or Kongo is usually portrayed with an open mouth representing the birth of all things. Nārāyaṇa or Rikishi is usually portrayed with a closed mouth representing the death of all things
Poetic justice! Destroy!
This line of figures is made by the Japanese company Toys Spirits, who make a large number of capsule type toys. Both Guhyapāda/Kongo and Nārāyaṇa/Rikishi come in Tan, White, and a dark Blue/Green version.