Nobunaga from FGO is a narcissist with massive self-confidence. Haughty and self-confident, she possesses a flexible way of thinking that loves new things and is not bound by conservatism and common sense. A person who played a huge role in ending the civil wars and brought down the Muromachi shogunate. Her military-style clothes are something she prepared in accordance with her own tastes when she was summoned as a Servant.
Nobunaga called herself the Demon King of the Sixth Heaven, which is the name of the demon king who ruled over the world of greed in Buddhism.
Her cruel acts in life, such as burning the temples of Mt. Hiei, and the fear and awe later generations felt towards her have caused her to appear in the form of a Demon King.
Nobunaga attempted to conquer all of Japan, but in the end was betrayed and slain by her retainers.
She often says "It can't be helped," and doesn't regret it.
She has no particular wish for the Grail, but there's a good chance with her creative m