Goemon Ishikawa is a key character in the anime series 'Lupin Sansei' (Lupin the Third). He is a highly skilled swordsman, descended from the legendary samurai Ishikawa Goemon. Known for his stoic demeanor and unparalleled swordsmanship, Goemon wields the Zantetsuken, a katana capable of cutting almost anything. His loyalty and honor are central to his character, often providing a contrast to the more carefree and mischievous Lupin. Goemon's role in the series involves assisting Lupin with his heists and adventures, often acting as the voice of reason within the group.