“Heh, these old bones are still good for something. Farewell, my prince. Live, and grow strong…”
—Jagen if he was made the decoy in Prologue IV of Shadow Dragon
Jagen (ジェイガン, translated Jeigan in the Japanese versions) is a playable character in Fire Emblem: Ankoku Ryū to Hikari no Tsurugi, Fire Emblem: Mystery of the Emblem, and Fire Emblem: Shadow Dragon. He is a veteran knight of Altea. He acts as Marth's guardian and often is one of the people Marth turns to for guidance. He is an invaluable unit at the start of the game due to being a much higher level than the rest of your units, but he has terrible growth rates and potential that severely handicap his usefulness later in the game. He steps out off the battlefield in Fire Emblem: Mystery of the Emblem but still stays by Marth's side as an advisor. Afterwards, he dies and his position is given to Cain. In Fire Emblem: Shin Monshō no Nazo ~Hikari to Kage no Eiyū~, he only takes to the field once just to train with the Avatar.
According to the Takayashiki Hideo's Mystery of the Emblem novel adaptation, Jagen is 58 years old. 
Like most other characters in the Akaneia Series of Fire Emblem, Jagen's personality is not very well-developed, with much emphasis having been placed on his functionality as a combat unit on the battlefield. That aside, like most other knights appearing in the series, Jagen has been portrayed to be an individual who is fiercely patriotic to the country whom he has pledged his allegiance to (Altea), participating in many battles under its banner for decades. His devotion to his country is especially evident in the Prologue of Shadow Dragon, where he is one of few units who can be selected to act as the decoy to ensure that Marth and the rest of his retainers succeed in fleeing Altea. Should he be chosen, Jagen's parting words are ones that are gallantly courageous, where he, in spite of the dire state of his situation, ironically muses over the suitability of his age being a deciding factor in him being chosen as the sacrifice.
More dimensions to Jagen's character are introduced with the onset of Shin Monshō no Nazo, where he frequently engages the Avatar in preambling discussions before the onset of each battle. Through these interactions, one can deduce Jagen to be both wise and prudent, as he constantly imparts sound advice to the Avatar to ensure that they form effective tactical decisions.
| Iron Sword|
| Silver Lance|
| Sword - D|
Lance - B
| Silver Lance|
*Normal Mode only.
| Sword - D|
Lance - D
“Sire... Fight for Altea...”
—Jagen's death quote in Shadow Dragon
Bones of Iron
After the war, Jagen laid down his lance and became one of Prince Marth’s closest advisors.
Non-Canon Appearances Edit
Jagen appears as an enemy, during one of Tiki's "Mirage Hunts" missions.
- During the production of the original Fire Emblem: Ankoku Ryū to Hikari no Tsurugi, Jagen was originally intended to be killed during the storyline, to provide a tragic coming of age moment where Marth would be forced to face the fact that he lost the adult he relied on. This sequence was scrapped from the final game and storyline, likely due to technical constants or the inconvenience of removing a unit from the player's use.