Eri Kasamoto is a key member of the S.P.A.R.R.O.W.S. intelligence agency within the Metal Slug franchise. She appears as a playable character in several entries of the series, including Metal Slug 3, Metal Slug 4, and Metal Slug 5. Alongside her teammates, she fights against General Morden's Rebel Army and various supernatural and extraterrestrial threats.
Raised as an orphan before becoming a prominent street gang leader, Kasamoto was recruited into military intelligence due to her exceptional combat and espionage skills. Within the gameplay of the franchise, she is highly distinguished by her specialization in demolitions and chemical warfare. Players utilizing her in
Metal Slug 3 (1993) benefit from her unique explosive capabilities, which include receiving a larger capacity of hand grenades at the start of missions and the ability to direct her throws more precisely than other characters.
Her role within the series narrative shifted during the events of
Metal Slug 5 (2000) and
Metal Slug 4 (2005). In
Metal Slug 4 (2005), she transitions into a supporting intelligence role rather than a frontline combatant, assisting the main coalition from headquarters. She returns to the active roster as a primary playable protagonist in
Metal Slug 5 (2000) to investigate the theft of secrets by the Ptolemaic Army. Across these specific titles, her distinct visual design—featuring a green bandana, sleeveless vest, and cargo shorts—has established her as a staple icon of the cooperative run-and-gun genre.