Also known as: 天童ケイ, 天童凯伊, 凯伊, ケイ(ブルーアーカイブ), Key(ブルーアーカイブ), ケイ, kei, 케이, Kei_Tendou, Tendou_Kei
A character from Blue Archive.
Originally depicted being visually identical to Aris (Blue Archive) as one of her systems, with the difference being the glowing Pink Eyes and, sometimes, Red Halo, and a tsundere personality. That version is tagged under Kei (Aris) (Blue Archive).
Later on she receives a new form as a robot with arms and wheels, Kei (Amas) (Blue Archive) (produced by Rio (Blue Archive)). She also appeared as Kei (Orange Robot) (Blue Archive), a robot with an orange visor.
In a further chapter, she hijacks a new body, first as Kei (Decagrammaton) (Blue Archive) (with pearl White Skin and a White Dress), and then transformed it into flesh as Kei (Student) (Blue Archive) (her playable version) based on Aris's body as a twin.
She later gains the Tendou surname when enlisting into Millennium Science School as Aris's sister with shared parentage.