Demon Archer is the Archer-class Servant in the Strange Tales of the Imperial Holy Grail of Koha Ace. She is one of the Servants of the Protagonist of the Grand Order conflicts of Fate/Grand Order.
Haughty and self-confident, she possesses a flexible way of thinking that loves new things and is not bound by conservatism and common sense.
Demon Archer's True Name is Nobunaga Oda the legendary warlord of the Sengoku and Azuchi-Momoyama Periods of Japan. "Devil King of the Sixth Heaven" is the name of a demon lord from Buddhism, which Nobunaga is said to have once self-styled.
Nobunaga had worked vigorously towards the unification of the country, but her end came from the insurrection of a vassal. She shows no regret about that in itself, saying it was "something that couldn't be helped." Does not particularly have a wish for the Holy Grail, but it is very likely that, due her tendency for unusual ideas, she may use the Holy Grail itself to make some sort of mess.