Question: why is ougi a boy in hanamonogatari?
Answer: In Hanamonogatari, Suruga refers to Ougi as 'Ougi-kun', 'he', 'this guy' and 'the boy'. When Suruga asks about it, Ougi tells Suruga that he/she has always been a boy since he/she were born. Later on Ougi states that they has forgotten that he/she is no longer a female.