K' (pronounced as 'K Dash') is a central character in The King of Fighters series, first introduced in KOF '99. As a genetically modified fighter, he possesses the power of fire after being infused with Kyo Kusanagi's DNA by the NESTS cartel. Initially portrayed as an anti-hero, K' seeks to reclaim his lost memories and rebel against NESTS. His cold demeanor and aloof personality make him a unique protagonist, and he plays a crucial role in the NESTS saga of the series.