This game is included in 3 for 1 Value Pack (Volume #6).
If you're wondering how to pronounce the name of KOF '99 lead character K', it's simply like this: Kay Dash.
In the game's Art Gallery mode, you'll see a lot of artwork for characters from previous KOF games who don't appear in King of Fighters '99. Among them are:
Goro Daimon (KOF '94-KOF '98), Chizuru Kagura (KOF '96-KOF '98), Athena Asamiya (in her previous outfits), Billy Kane (Fatal Fury-KOF '98), Ryuji Yamazaki (Real Bout Fatal Fury-KOF '98), General Heidern (KOF '94-KOF '95, KOF '98), and Kyo Kusanagi (his original look from KOF '94 to KOF '98).
Athena and Kyo do make appearances, but in new costumes. Athena changes her costume as she does in every KOF, but '99 marks the first year that she has a returning voice actress (Haruna Ikezawa, who would continue to voice Athena in all subsequent KOF games). Kyo would ditch his previous black jacket/pants and white shirt for a new white jacket, blue jeans, and black shirt outfit (he even burns the last part of his old costume, a headband, in his intro). His '94 and '95-'98 designs are still playable, however, as the Kusanagi clones Kusanagi-1 and Kusanagi-2.