His full name is Tarmicle Roving III. Born the son of a distinguished soldier in Hokkaidō, Japan, Tarma joined the army's training college for special tactics and combat straight out of Junior High. When he was 20 he rescued the president and used this to get himself transferred to the Peregrine Falcon Squad (PF Squad) where he became best friends with Marco Rossi and upon learning Marco was to go and fight in the Great War (a fictional battle in the future) he volunteered and fought and survived the war alongside his friend leading to his promotion to Captain, the rank he still holds as of Metal Slug 6.
Tarma is an expert motorcycle engineer and builds custom bikes for fun in his spare time. He had intended to retire and set up a shop, but his requests for a discharge from the military have always been denied.

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Fio is the only daughter of a wealthy Italian family. After she was born, her mother was unable to have any more children, making Fio the first heiress in the history of her family, as she had no older siblings. Throughout the generations, the Germi family has made a tradition of sending their eldest child into the military; Fio upholds this tradition willingly, though she has aspirations of becoming a doctor someday, having studiedchiropractics, acupuncture, and moxibustion in college.[1] Fio is a Master Sergeant of the Intelligence Agency's S.P.A.R.R.O.W.S, which serves as a special forces group for the government. As with her comrades in Metal Slug 2 and beyond, she had risen through the ranks for her service against General Morden. She has also appeared in the King of Fighters series, first as a Striker in The King of Fighters 2000, and then being playable for the first time in KOF: Maximum Impact 2.

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Eri is an orphan, abandoned on the steps of a church. Once she was mature enough, she fled the church and became a leader of street kids. The Intelligence Agency of the Government Forces noticed her combat skills and recruited her. She went on to receive special spy training for those with special talent and successfully completed a number of missions as a first rate agent. But Eri, weary from the series of missions involving assassinations and plots that took a hard toll on her conscience, requested to be transferred to the Special Ops Squad S.P.A.R.R.O.W.S. Her request, which normally would go ignored, was specially granted given her achievements and superior abilities. She exhibited her abilities perfectly in the suppression of Morden’s second coup d’etat to stop it in its tracks. For her efforts, she received a promotion to sergeant second-class.

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Ryu (リュウ Ryū?, written as 隆 Ryū in the original Street Fighter) is a video game character created by Capcom, from the Street Fighter series. Premiering in the first Street Fighter, Ryu appears as the lead character from the game along with his best friend Ken participating in the Street Fighter tournament. Further games from the series show Ryu to be highly focused on his training, aiming to become the strongest he can. Both Ryu and Ken are practitioners of a nameless martial art rooted as an assassination style. Both Ryu and Ken learned their art from Gouken, who refined the style as a purely combative non-killing style. Since the SNES version of Street Fighter II, Ryu's fighting style has been referred as "Shotokan" in the English localization of the games' instruction manuals and related literature.

While Ryu and Ken follow the same martial arts discipline, as the Street Fighter series evolved, the differences between the two characters was portrayed by their attacks: Ryu focused on technique while Ken opted for stylish unpredictability. His Shōryū-ken (昇龍拳?, "Rising Dragon Fist") does only one hit, so Ryu can effectively use this move at full power against airborne opponents. Ryu focuses more on the Hadou principle of his style, which translates to him being very skilled with his usage of ki - Ryu has the most concentrated Hadōken (波動拳?, "Surge Fist") amongst all users. In addition, Ryu has mastered the Tatsumaki-Senpū kyaku (竜巻旋風脚?, "Tornado Whirlwind Kick"), a powerful kick performed in mid-air. Ryu has been given special moves in various games, among those, Jōdan Sokutō Geri (上段足刀蹴り?, "High Side Kick"), a fast side kick only available to him in the iterations of Street Fighter III.

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Ken Masters (ケン Ken?) is a video game character created by Capcom. He is one of the main characters from the Street Fighter series of fighting games alongside Ryu. Ken made his first appearance in the original Street Fighter released in 1987. The character's name was originally spelled in Japanese as 拳 (Ken), which is the kanji character for fist, although Capcom dropped this in subsequent games, spelling his name in katakana instead (ケン). Ken is described as a former sparring partner, rival and best friend of the main character, Ryu, who trained under the same master (a character whose identity would later be fleshed out as Gouken).

In the original Street Fighter, and in the first iteration of Street Fighter II, Ken was identical to Ryu, in terms of game play, with only one attack (a throw) appearing to be aesthetically different. In later Street Fighter II editions, Ken's character was modified to be a variant of Ryu, using modified versions of Ryu's special attacks, though his animations and other attacks were still very similar to Ryu's, as Ken's sprite is always a head swap of Ryu. In the original version of this game, the only way to effectively have two characters with similar abilities fight each other was to have one player play as Ryu and the other play as Ken.

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