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-travelling 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.
In WarioWare Gold
Chrom appeared in WarioWare Gold. He appeared in 5-Volt's microgame, Fire Emblem Awakening, which the player controls him to defeat Victor. The player loses the microgame if Chrom does not defeat Victor or defeats his own allies.
Super Smash Bros. series
Super Smash Bros. 4
Super Smash Bros. Ultimate
Chrom appears in Super Smash Bros. Ultimate as Roy's Echo Fighter. 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.
- Chrom is the second character in the series from making cameos in a fighter's Final Smash, then playable in the next installment. Palutena is the first character to do this.
- In the Mysterious Dimension sub-area in Ultimate, there is a quiz asking which spirit is Chrom's younger sister.
- Chrom so far is the only fighter in the Super Smash Bros. series to have their victory theme be changed via game updates, as in Ultimate he previously had the standard Fire Emblem victory theme before it was changed to the Awakening victory theme in version 3.0.0.