Roy

Roy is a fifteen-year-old swordsman and the main protagonist of Fire Emblem: The Binding Blade, who made his debut as a character in the crossover game, Super Smash Bros. Melee. Roy is the son of Eliwood of the House Pherae, taking over leadership of Pherae's army in place of his ill father during the Disturbance of Bern.

Super Smash Bros. Melee
Roy is an unlockable character in Super Smash Bros. Melee, unlocked by beating Classic or Adventure as Marth or by playing 900 Melee matches, then by defeating him on Temple. During development, Nintendo of America and Masahiro Sakurai discussed possibly removing Roy for the Western release of the game, but ultimately decided to keep him in. Roy's moves are similar to Marth's, but are strongest at the hilt of his blade. In general, Marth's sweetspotted attacks are stronger than Roy's, but the sweetspot on Roy's sword is larger. As an aesthetic detail, some of Roy's moves deal fire damage, reflecting the fire powers of his sword in Fire Emblem: The Binding Blade. Roy is voiced by Jun Fukuyama; like Marth, all of his voice clips are kept from the Japanese release, reflecting the Japan-only status of the Fire Emblem series at the time.

Roy's standard special move is Flare Blade, which has Roy charge a sword strike that deals an explosion. His side special move is Double-Edge Dance, which is similar to Dancing Blade. His up special move is Blazer, which sends Roy into the air as he slashes upward, dealing fire damage to opponents. Finally, his down special move is Counter, which deals more damage than Marth's version of the move (1.5x damage) but is slower and does not remain active as long.

Super Smash Bros. Brawl
Roy's only appearance in Super Smash Bros. Brawl is as a Sticker, depicting his regular appearance in Fire Emblem: The Binding Blade. It increases the power of slashing attacks by 24.

While Roy is not a playable character in the game, files for Roy exist on the game disc, indicating that he may have been planned to be a playable character at one point.

Super Smash Bros. for Nintendo 3DS / Wii U
Roy is a downloadable character along with Mewtwo, Lucas, Ryu, Corrin, and Bayonetta in Super Smash Bros. for Nintendo 3DS / Wii U, released the same day as Lucas and Ryu, on June 14, 2015. His appearance in this title is primarily based on his Great Lord design in Fire Emblem: The Binding Blade, while taking elements from his appearance as downloadable content in Fire Emblem Awakening. His voice actor from Super Smash Bros. Melee, Jun Fukuyama, reprises his role for this game, giving Roy new voice clips.

Like in Super Smash Bros. Melee, Roy's attacks are strongest when hitting closer to the hilt of the blade, with yellow sword trails that indicate the sweetspot on his sword similar to Marth. While his special moveset has not changed from his previous appearance, some of Roy's other moves and animations have been altered to further differentiate him from Marth. He also moves faster than he does in Super Smash Bros. Melee, especially while in the air, though he is also heavier than before. In addition, as a result of the redesign, Roy is around the same height as Marth rather than being shorter, though his attacks still do not reach as far. Finally, Roy has been given a Final Smash: Critical Hit, which operates differently from Marth and Lucina's version of the attack and involves him swinging his sword overhead to trap opponents before slashing them.

One of Marth's color swaps resembles Roy's original appearance.

Super Smash Bros. Ultimate
Roy reappears as an unlockable playable character in Super Smash Bros. Ultimate, retaining his appearance and several of his moves from Super Smash Bros. for Nintendo 3DS and Wii U. Additionally, Chrom is playable, being an Echo Fighter of Roy. Similarly to Marth, Roy's voice is now dubbed in English, being voiced by Ray Chase. Flame effects are now included in more of Roy's attacks, further referencing his sword's fire powers. Roy receives benefits from universal changes, having faster mobility; reduced landing lag in his aerials and short hop timing; a greater recovery, due to the reintroduction of directional air dodges and his increased air speed; and a greater offensive play, due to the abilities to use any grounded attack out of a run and using aerial attacks on ladders, as well as his own attacks dealing more knockback.

On a side note, as with several other returning fighters, Roy's (as well as Marth and Ike's) victory theme has been sped up compared to the previous installments.

In the World of Light, Roy's puppet fighter is found on Galeem's side in the Final Battle area alongside Palutena and Master Hand, and must be awoken to progress the story.

Super Smash Bros. for Wii U
The following dialogue applies also to Mewtwo, Lucas, Ryu, Cloud, Corrin and Bayonetta, all additional fighters like Roy.
 * Pit: Who is THAT?
 * Palutena: I have no data on this fighter. I can't believe it!
 * Viridi: It must be an intruder from another dimension!
 * Pit: Whoever it is, the goal remains the same: to fight and win!

Super Smash Bros. Ultimate

 * Pit: Look! Marth just dyed his hair red!
 * Palutena: Actually, that's the Young Lion, Roy.
 * Pit: The Young Lion?
 * Viridi: He's 15 years old.
 * Pit: 15 years old?! Is that even legal?!
 * Viridi: It is in Ostia, where Roy spends his days as a noble, being smart, brave, and dependable. I bet he smells like heaven!
 * Pit: How am I supposed to compete with a guy like that?
 * Palutena: By not getting too close, for one thing. His Binding Blade is extremely powerful at close range.
 * Pit: Or maybe instead of fighting, he'd be willing to talk out our differences?
 * Palutena: Don't be a baby, Pit. Just keep Roy at a distance and you'll be fine. He's only dangerous if he gets close. But once he gets close, prepare to get mauled.

amiibo

 * Roy is the main character of the Fire Emblem: The Binding Blade game. In The Binding Blade, Roy led the troops of Pherae into battle in his ailing father's stead, and now he brings his speed and talent for short-range combat into Super Smash Bros. for Wii U & Nintendo 3DS. His sword, the Sword of Seals, is uniquely powerful at the base of the blade.

Super Smash Bros. Ultimate Super Smash Blog bio

 * Get up close and personal for major damage! Unlike Marth, Roy's attacks are more powerful the closer you get to the base of his blade. For his Final Smash, his sword bursts into flame and sends anyone caught in the blast flying.

Quotes

 * "I won't lose!"
 * "That was a fierce battle!"
 * "Failure is not an option!"
 * "Now the true battle begins!"

Trivia

 * In Super Smash Bros. Melee, Roy (along with Ganondorf and Sheik) does not appear as an opponent in the game's Classic Mode, though he can appear as an ally in Team and Giant battles. As a result, his introduction image for Classic Mode goes unused.
 * Roy is the only fighter in Super Smash Bros. for Nintendo 3DS, Super Smash Bros. for Wii U, and Super Smash Bros. Ultimate to share a name with another fighter in the same game. Despite this, the announcer has unique voices for each one:
 * In English (which is also used in Japanese, Korean, and for Ultimate, Chinese) and German, Fire Emblem Roy's name is spoken in a more energetic tone, similar to the announcer in Super Smash Bros. Melee, while Roy Koopa's name is spoken in a deeper tone.
 * In French and Dutch (in Ultimate), the announcer calls Fire Emblem Roy with a slightly higher-pitched voice than Roy Koopa; conversely, in Spanish, he calls Roy Koopa with a slightly higher-pitched voice instead.
 * In Italian, the announcer rolls the "r" much longer for Roy Koopa, while Fire Emblem Roy is pronounced with a longer "o".
 * In the Russian version of Ultimate, Fire Emblem Roy is pronounced with a shorter "o" than Roy Koopa.