Nana

Armor Valkyrie VII or Nana for short, is a magical entity previously known as "Armor Golem V7" named Nana by Nina. Along with Amelia, Nina and Sierra, she's one of the first slaves of Tooru's, presumed to be the fourth. She's 2 meters tall. Created for the purpose of exterminating the Divine Corpse Fragments, she was sent in from a different world along with her inactive power plant that has been sleeping for several thousand years in this world; Oruto considers her a sister. She lost the memory of her original mission and she was thought to be some ancient Armored Golem by Amelia’s group...