I went back and watched all the GKCs since my Japanese has gotten to the point where I can understand the majority of what is being said (Hallelujah!)
So here is a master post of all the times that GACKT has been on program and won.
He was absent for the 2011 NY Special, which is why it isn't included here.
2009
Length: 2hrs
Partner: Yoshida Hidehiko (Judo/mixed martial artist)
Highlight: Gackt being gorgeous and winning
http://m.pandora.tv/?c=view&ch_userid=boyboy1242&prgid=36803320 2010
Length: 2.5hrs
Partner: Tsunku (Producer/Songwriter)
Highlight: Gackt being gorgeous and winning
http://m.pandora.tv/?c=view&ch_userid=boyboy1242&prgid=36809337 2012
Length: 3hrs
Partner: Kiriya Kazuaki (Director/Photographer)
Highlight: Gackt and Kazuaki being gorgeous and winning
http://m.pandora.tv/?c=view&ch_userid=keigoo&prgid=44300584 2013
Length: 2.5hrs
Partner: Kobayashi Masato (Kickboxer)
Highlight: Gackt And Masato being gorgeous and winning
http://m.pandora.tv/?c=view&ch_userid=anubis73&prgid=47281296 2014
Length: 2.5hrs
Partner: Nishikawa Takanori, aka T.M. Revolution (Singer)
Highlight: Gackt being gorgeous, his interactions/hugs with TMR and winning
http://m.pandora.tv/?c=view&ch_userid=codeno001&prgid=49773149&ref=channel 2015
Length: 3hrs
Partner: Kiryuuin Shou of Golden Bomber (Singer)
Highlight: Gackt being gorgeous and Shou having panic attacks the entire time and of course, winning
http://m.pandora.tv/?c=view&ch_userid=gogoucc&prgid=51731661&ref=ch 2016
Length: 3hrs
Partners: Kitayama Hiromitsu and Nakayama Yuma (Johnny's Entertainment, singers/idols)
Highlight: Gackt being gorgeous and not killing the boys
http://m.pandora.tv/?c=view&ch_userid=gogoucc&prgid=53339058 Here's looking forward to G being on the 2017 program as well!