Chrom is the main protagonist of Fire Emblem Awakening. A distant descendant of the Hero-King Marth, Chrom is the prince of the Halidom of Ylisse, younger brother to its leader, the Exalt Emmeryn, and the leader of a group of Ylissean soldiers known as the Shepherds. The story of Awakening begins with Chrom, his sister Lissa, and his bodyguard Frederick, finding an amnesiac tactician by the roadside who joins the Shepherds. After Ylisse's struggle against the neighboring nation of Plegia, Chrom becomes the new Exalt of Ylisse, gets married, and becomes the father of a baby girl, Lucina.
During a war against the warmongering empire of Valm two years later, a time-traveling Lucina from the future of another timeline reveals herself, warning Chrom of the looming threat of the Fell Dragon Grima who had destroyed the world in her timeline. Chrom, Lucina, and the rest of the Shepherds work together to defeat Walhart of Valm, Validar of the Grima-worshipping Grimleal, and Grima himself.
Chrom, like most Fire Emblem protagonists, begins in the Lord class. His signature weapon is Falchion, inherited by the royal family of Ylisse as descendants of Marth; Chrom also uses Falchion's counterpart, the Fire Emblem or Binding Shield. In addition to Lucina, Chrom can also be the father of another child depending on who he marries.
Since Awakening, Chrom has appeared in a number of other games. He makes an appearance in an Awakening-based mission in Fire Emblem Fates, where he meets Corrin. In the crossover game Project X Zone 2, he is one of three playable Nintendo characters (alongside Lucina and Fiora). Chrom is also prominently featured as a major character in both Tokyo Mirage Sessions ♯FE and Fire Emblem Warriors, and is one of the many units the player can recruit in Fire Emblem Heroes.
Chrom appears in Lucina and Robin's trailer. In the beginning, he is shown lying on the ground after being incapacitated by Captain Falcon in battle. Lucina defends him, but is almost defeated herself. For the majority of the trailer, he is only seen laying on the ground. However, at the end, still badly hurt, he remarks that he "will get [his] chance another day;" a gameplay video immediately after this scene displays Robin’s Final Smash and states that Chrom will get it today instead, confirming his involvement as part of the Final Smash. He also appears at the top of Lucina and Robin's "New Challenger" artwork on the official website.
While he was considered to be a playable character due to the seemingly credible Gematsu leaks, he is not a playable character in SSB4. According to Masahiro Sakurai, he did initially consider adding Chrom as a playable character after playing Fire Emblem Awakening in his spare time, but denied him in favor of Robin when he saw that Chrom would end up another swordsman made redundant by the existing fighting styles of Marth and Ike. Robin would allegedly remedy this by providing a plethora of unique moveset options with Tomes and the Levin Sword. This is referenced in Pit's Smash Taunt for Robin, where Palutena and Viridi deride Chrom for being a "carbon copy" of Ike, irking Chrom by saying so.
In the game, he will appear as part of Robin's Final Smash, Pair Up. After being summoned by Robin with warp magic, Chrom lunges in Robin's direction. If he successfully connects with an opponent along the way, he'll launch the opponent into the air and repeatedly strike them with his Falchion, while Robin will attack with various tomes. Chrom also appears in one of Robin's victory poses, where the two stand back-to-back and he may comment "my strength is yours!"
As a background character
Chrom also appears as a special guest character during Pit's conversations with Palutena in Palutena's Temple if Robin is present. Chrom's portraits and Critical Hit cut-in artwork from Awakening are reused in the aforementioned Smash Taunt and Pair Up, respectively.
As a costume
Chrom's costume serves as a alternate color scheme for Ike. His design is also the basis of a downloadable costume for Mii Swordfighters. Nintendo also released a QR code for those who wish to have the exact Mii used in the costume's advertising.
Chrom appears as a trophy in both versions of SSB4.
As a playable character
Main article: Chrom (SSBU)
Chrom makes his debut as a playable fighter in Super Smash Bros. Ultimate after being a background character in the previous game, now branded as an Echo Fighter of Roy. He was revealed alongside Simon, Richter, Dark Samus, and King K. Rool in the August 2018 Smash Direct. Matthew Mercer and Tomokazu Sugita, Chrom's recurring English and Japanese voice actors respectively since Awakening, both reprise their roles and confirmed such on Twitter.
Chrom's inclusion was primarily facilitated by popular demand both within and outside of the Super Smash Bros. Fighter Ballot. In a Famitsu interview shortly following the August 2018 Smash Bros. Direct, Masahiro Sakurai revealed that Chrom and fellow Echo Fighter Dark Samus were highly requested characters but in different regions of the world; most of the support for Chrom came from Japan while Dark Samus's came from overseas, being North America and Europe.
The primary difference distinguishing Chrom from Roy is that his sword attacks lack a hilt sweetspot, instead dealing consistent damage across the entire blade, akin to Lucina's Parallel Falchion; this makes Chrom far more consistent and gives him vastly superior spacing abilities at the cost of partially losing some of Roy's potentially devastating damage output and KOing ability. Chrom's neutral attack, forward tilt and up tilt all have altered animations where Chrom holds his sword in a standard grip; forward tilt in particular has vastly improved range since Chrom moves slightly forward during the move, and the altered animation means that it hits much lower as well, being able to hit ledge-hanging opponents. Additionally, Chrom does not have flame properties on his up smash, down aerial, or any of his special moves, unlike Roy. His Flare Blade is nearly identical in function to Roy's version, although it uses the normal effect, and it is aesthetically different as well. His Double-Edge Dance is nearly identical in function to Lucina's Dancing Blade, due to its lack of a hilt sweetspot, and the finishing hits not using the flame effect. His up special, Soaring Slash, is a unique move that is functionally similar to Ike's Aether; it features Chrom ascending while twirling with his sword in his hand before quickly descending downward, albeit without throwing the sword up first; while the move offers decent vertical distance, the move's near-complete lack of horizontal distance, coupled with it being Chrom's only recovery option, results in Chrom's recovery often being widely regarded as one of the worst in the entire game. His Counter is nearly identical to Roy's version, but does not use the flame effect, and deals slightly more knockback. Finally, his Final Smash, Awakening Aether, is a unique move, with Chrom dashing forward to catch his opponents rather than standing still. Additionally Chrom has a unique victory quote if he wins against Lucina; in any of his three victory screens, he may say, "Our bond is stronger than steel."
Prior to version 3.0.0, Chrom shared the standard Fire Emblem victory theme with Marth, Roy and Ike, despite fellow Awakening characters Robin and Lucina now having a new victory theme based on Fire Emblem Awakening's "Id (Purpose)."
As a costume
The Chrom Mii Swordfighter costume also returns as an unlockable outfit after being DLC in the previous installment.