So I was re-watching BTS's halloween Bangtan Bomb when it finally clicked for me who V was. I honestly feel a little dumb because this anime/manga used to be one of my favorites when I was a kid.
So V is none other than a gender-bended Cardcaptor Sakura. He's wearing her school uniform. Complete with the patch on her sleeve. Not to mention he's carrying his very own Kero. (BTW sorry for the horrible pics of V just trying to find parts where you could see his costume and stuffed animal well). It completely makes my day that this is what he decided to be for halloween.
So as usual I do not own any of these pics nor do I claim to.