Killer App: The original Samurai Shodown on the Neo Geo home console.
Port Overdosed: The original Samurai Shodown is one of the more recent games to qualify, due to SNK's near-constant stream of compilations and re-releases over the last decade.
Promoted Fanboy: Nobuhiro Watsuki, creator of popular anime and manga such as Rurouni Kenshin, Busou Renkin and Gun Blaze West, mentioned early in Rurouni Kenshin that he is hooked on the Samurai Shodown series and bought a Neo Geo CD just to play it. He continued to write Samurai Shodown-related notes in subsequent releases of Rurouni Kenshin manga. In 2003, SNK hired him to design new characters for Samurai Shodown V.
Subverted by Yasuhiro Nightow, Japanese mangaka and game creator who created the anime and manga Trigun. In his previous time as doujinshi artist he created a Samurai Shodown-based manga book, yet later reflected that he isn't very proud of his work for that book and requested that there be no further reprints. Ironically, the book's notoriety is what caused SNK to notice his love for the series and later lead to his job for designing Youkai Kusaregedo in Samurai Shodown V.