Konoha pool party

[Marin]

That still doesn't make her a guy in any way. But that's not the point of this thread in the first place.

It was a refference. A joke dammit. A joke!

 

[Deadlift]

"Masashi Kishimoto initially stated that he wasn't completely sure yet about the gender of this jinchūriki. Based on the concept art of Fū in Road to Ninja: Naruto the Movie, it would appear that Kishimoto has decided that Fū is a girl."

It's the same situation like Haku, but this time it wasn't revealed, hence - PLOT TWIST

Yeah? But I wouldn't ever doubted about her gender, she has a feminine silhouette also