Marth (マルス, Marth) is the main playable hero in the first and third installments of the Fire Emblem series of tactical role-playing games. Previously well-known primarily in Japan for a game series that was never localized abroad, Marth was included in all language versions of Super Smash Bros. Melee as a playable character. His popularity and competitive success in that game along with that of his similar counterpart Roy had strongly influenced Nintendo's decision to release all subsequent Fire Emblem titles (excluding New Mystery of the Emblem) internationally.
The first game in what would become the long-running tactical role-playing medieval high fantasy series Fire Emblem, released on the Famicom (Japanese NES) and entitled Fire Emblem: Shadow Dragon and the Blade of Light), introduced Marth as the main character. His design was noticeably different from his modern-day incarnation. The second game in the series, Fire Emblem Gaiden, took place on the same fictional world but on a different continent and was only tangentially related to the first and did not feature Marth. The third game however, titled Fire Emblem: Mystery of the Emblem and released on Super Famicom (Super NES) early in 1994, was both a remake of the original game and a continuation of that game's story. Marth underwent a character redesign to resemble the more "bishōnen" prince he is portrayed as in today's modern image of him, and he became the only Fire Emblem series main character to feature in a starring role from the start of the game in more than one installment. In both games, his in-game unit is the only one that belongs to the Lord character class, which became tradition with all main starring characters of subsequent titles, being units that must be kept alive and start out weak but become very powerful over the course of each game.
Marth also stars in remakes of the first and third Fire Emblem games on DS. He also has a notable legacy shown in Fire Emblem Awakening, with two of its major protagonists, Chrom and Lucina, being his distant descendants. Marth is available as a playable character in Awakening via SpotPass and DLC as an Einherjar, Fire Emblem Fates via amiibo and DLC, and Fire Emblem Echoes: Shadows of Valentia via amiibo as an illusory unit. He also features prominently in the Fire Emblem crossover games Fire Emblem Heroes and Fire Emblem Warriors as one of many playable characters.
Neither Marth nor any Fire Emblem content appears in the first Smash game. However, according to an interview from Making of Fire Emblem: 25 Years of Development Secrets, Masahiro Sakurai wanted to include Marth as a playable character in that game, but was unable to do so due to time constraints. 
Main article: Marth (SSBM)
Marth makes his Smash debut (and by extension, his international debut, excluding the Mystery of the Emblem anime adaption, which was released in North America) as an unlockable character in Melee. His design is based off his appearance from Fire Emblem: Mystery of the Emblem. He can be unlocked one of three ways: using all fourteen starter characters at least once each in Vs. Mode matches, beating Classic mode with all fourteen starter characters on any difficulty, or playing 400 Vs. mode matches. In each of these cases, after fulfilling the conditions Marth must be battled one-on-one to be unlocked.
Marth is one of the game's most effective fighters, currently ranking 3rd on the Melee tier list. His strengths include the long reach of his sword attacks and the very good damage and knockback specs of the "sweet spot" on the tip of his blade, his moderately fast dash, long grab, usefully floaty wavedash, excellent edgeguarding capabilities, easy and efficient combos, and great SHFFL, with his drawbacks being his lack of a projectile attack and laggy up special recovery. Marth's "clone", Roy, has attacks that are almost identical in animation, and many "Marth vs. Roy" debates ensued in the years following Melee's release but professional analysis places Marth in a higher tier than Roy because he lacks Marth's subtle but vital advantages.
All of Marth's standard and special attacks involve him using his sword, the Falchion.
Main article: List of SSBM trophies (Fire Emblem series)
As with the other playable characters in Melee, Marth has three trophies which are obtained by defeating the single-player modes - a normal trophy from Classic Mode and two "Smash" trophies from Adventure and All-Star Modes respectively. The text of his Classic Mode trophy reads:
Main article: Marth (SSBB)
Marth returns as an unlockable playable character. Like Melee, his appearance is based on his design from Fire Emblem: Mystery of the Emblem. Marth has superior reach to most characters in the game, and relies on the length of his sword to effectively zone against his opponents. It is uncertain as to whether or not he has been nerfed from Melee like a lot of other higher tier characters. He is currently in the A- tier according to the official SBR tier list.
Main article: List of SSBB trophies (Fire Emblem series)
Main article: Marth (SSB4)
Marth returns as a playable character in Super Smash Bros. for Nintendo 3DS / Wii U. Marth is now a starter character, as opposed to being an unlockable character as he was in Melee and Brawl. He has been visually updated to closely match to his design from Fire Emblem: New Mystery of the Emblem: Heroes of Light and Shadow, although Falchion retains its design from the original Fire Emblem: Mystery of the Emblem.
During the initial release of SSB4, Marth was considerably nerfed, with few noteworthy buffs. These nerfs left him with less mobility and range relative to the cast (though his own range has been improved from Brawl), weakening his neutral game and depriving him of his potent comboing and punishing capabilities from previous games. Because of this, he had previously seen a huge drop in his tier placement. However, he has since received multiple buffs in update patches, with the most notable patch, 1.1.4, granting him improvements to his aerial combos and juggling game, as well as granting bigger tipper hitboxes, and higher damage output on several attacks. As a result, Marth is reasonably better than he was during the initial release of SSB4, and has since seen significantly improved tournament results. Overall, although he's still considered fairly nerfed from Brawl, he ranks highly on the SSB4 tier list, ranking 10th out of 58 characters.
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