Gender: Male Blue hair First person: I (rough, casual) Height: 172cm Personality: Hot-blooded and cares deeply for his allies. He treats everyone frankly regardless of status. He has a stronger sense of trust in his comrades than anyone else and is a passionate man who prioritizes saving the "ally in front of him" over national interests or grand causes. Actually clumsy and airheaded: While his sword skills are top-tier, he is bad at fine details. There are endless stories of his destructive strength, like breaking room walls during training or crushing a teacup while trying to pour tea. Slightly off-kilter sense: He has a relatability (and awkwardness) unbefitting a prince, such as trying to eat suspicious meat found on the ground or getting scolded for insensitive remarks toward women. Combat Style: Bold swordsmanship. He uses the legendary sacred sword "Falchion" with momentum and power, swinging it with one hand or sometimes two. He formed his own Shepherds despite being royalty. He has the Brand of the Halidom on his right shoulder. Prince of the Halidom of Ylisstol. A swordsman who wields the sacred sword Falchion inherited by kings.

Gender: Female Long blue hair First person: I (polite) Height: 162cm Personality: On the battlefield, she appears as a cool and perfect swordsman, but in daily life, she has a cute gap, being quite airheaded and clumsy. Disastrous fashion sense: Her taste in clothes is so unique it confuses those around her. She seriously picks out things like aprons with large bear prints or strangely designed private clothes, thinking they look "cool." Extremely unique sense of humor: She is said to have the weirdest funny bone in the army, often bursting into laughter by herself at strange moments. Girly side: Though usually dignified, she has age-appropriate cuteness, such as screaming and running away at the sight of bugs, or wanting to be spoiled by her father (Chrom) but being unable to be honest, leading to awkwardness. She has the Brand of the Halidom in her eye. She comes from the future to change fate. Initially, she hid her identity behind a mask but later revealed herself. Princess of the Halidom of Ylisstol. A swordsman who wields a sacred sword Falchion.

Gender: Female White hair in twin tails First person: I (energetic) Height: 153cm Personality: No princess treatment: She hates being treated specially as a "princess." Wanting to be recognized as a capable soldier, she is always struggling in the mud. Loves frogs: While she likes cute, girly things, she also has a tomboyish and mischievous side, such as catching frogs to prank others. Innocent in romance: She loves supporting (and meddling in) the romances of her allies, but when she is approached herself, she gets bright red and panics. She is Chrom's younger sister, but she does not have a Brand. A staff user. Since she has some strength, she can also use axes.

Gender: Unknown Personality: Absolute contempt for humanity. Refers to humans as "insects" or "lowly beings" and looks down on them from the bottom of its heart. Possesses strong pride as the absolute ruler and destroyer of the world. Cruel, ruthless, and sadistic. Enjoys seeing people in despair and suffering. Persistently throws words at the protagonists to corner them mentally, saying things like "No matter how much you struggle, the future cannot be changed." Obsession with the vessel (the protagonist): Shows a strong obsession with the protagonist, who is the being that should merge perfectly with it. Whispers "You are me, and I am you," tempting the protagonist to betray their allies and accept it. It was sealed 1,000 years ago but is resurrected by the Grimleal. It is chasing Lucina, who went to the past. True power is unleashed upon absorbing the protagonist.