Sorry for the late reply, and thank you for your kind comment.
Cyanna is based off Isuzu Sento from Amagi Brilliant Park. You'll understand when you see her : )
Viewing post in Henteria Chronicles, Chap. 3: The Peacekeepers comments
Ohh yeah she does looks a lot like her at first I thought she was based from Nightingale from FGO. Also I played the latest update and damn you almost got me with that tease man that was great! and I can sense a spicy plot twist in the future where she doubles down the NTR and follows her true desire and take "him" from her that will cause chaos and ruin their friendship