While Hard Gay, whose real name is Masaki Sumitani, hit it big in Japan back in 2005, he hasn't appeared that much on television of late, save for the occasional appearance here and there.
At this Halo event, Game Impress Watch reports that Sumitani worked in his "Fooohhh!" catchphrase by exclaiming "Halo Fooohhh!" (GEDDIT?!)
「Halo4」前夜祭レポート [Game Impress Watch]