Gackt is Kyo Kusanagi

Gackt's Outfit in Moon Child Resembles
Kyo Kusanagis White Jacket With a 
Cross Shirt in kof99 onward the Nest Saga.

Gackt is a famous J-rock idol also known 

to Resemble Squall Lionheart from FF8.

Kyo is known from the King of Fighters

Games being mostly the Protagonist.