Game Script
When someone's talking, press Z to see the whole script for that chapter. It only includes stuff you've seen, though.

In-game reset
While playing a game, hold X + B + Start.

Ashanard
Successfully complete the game fifteen times to unlock Ashanard when playing the bonus trial maps.

Astrid
In the mission where you are supposed to protect the Apostle's ship, there is a Bow Knight named Astrid. Have Ike talk to her and she will join your team. She has the Paragon skill which makes her gain lots of experience points.

Brom
In the "Prisoner Release" mission, open Brom's cell door. Have Ike talk to him and he will join your team. He is in the same room as Kieran. He is average, but not that great towards the end.

Bryce
Successfully complete the game ten times to unlock Bryce when playing the bonus trial maps.

Devdan
Devdan is a Halberdier who is indebted to Duke Tanas. On the mission where you are sent to investigate Tanas's, make sure to bring Mist, Rolf, Soren, or Ilyana. Devdan will attack anybody except children. Have one of these four characters talk to him and he will join your team.

Gatrie
Gatrie leaves you around Chapter 8, but returns later in the mission where you must protect the Apostle's ship. After getting Astrid, have her talk to Gatrie and he will join your team. You will now have your wall back.

Ilyana
In Chapter 8: Despair & Hope, there is a female mage, nine spaces north and two spaces west, named Ilyana. Have Ike talk to her and she will join your team. She has Elithunder as her attack.

Jill
Jill joins you automatically on the way to Bengion. She is a Wyvern Rider, your first, or perhaps second, flying unit. She stays with you all the way until you invade Daein. If you want to keep her, make sure you do not use her in any battles in Daein.

Kieran
In the "Prisoner Release" mission, have Oscar talk to Kieran and he will join your team. Kieran is an Axe Knight.

Makalov
In Chapter 14, after the Apostle gives your first mission, bring Marcia. In the top left of the screen is a Sword Knight named Makalov. He is Marcia's brother. Have Marcia talk to him and he will join your team.

Marcia
In Chapter 3, make sure Ike talks to the Pegasus Knight at the top left of the screen before she gets killed. Do not worry too much; she dodges a lot. She will mumble something about repaying a debt and flies off. If you do this, later in Chapter 9 she will return about two to four turns into the mission. Have Ike talk to her and she will join your team. She is not the greatest, but with a bit of work turns into a very reliable unit. Plus, she flies.

Mia
In Chapter 7, after a few turns, a charter named Mia will walk on screen from the East Exit. Have Ike talk to her and she will join your team. She has a sword.

Nephenee
In the "Prisoner Release" mission , open Nephenee's cell door. Have Ike talk to her and she will join your team. Nephenee is a soldier and can become one of your better units.

Oliver
Successfully complete the game three times to unlock Oliver when playing the bonus trial maps.

Petrine
Successfully complete the game seven times to unlock Petrine when playing the bonus trial maps.

Shihiram
Successfully complete the game five times to unlock Shihiram when playing the bonus trial maps.

Lose Shinon and Gatrie
In Chapter 8: Despair & Hope, after Ike's father dies, Shinon and Gatrie will leave thinking that Ike is not a capable leader.

Triangle attack
This is a special attack that can be done with Boyd, Rolf, and Oscar. They all must be able to use a bow, meaning Boyd needs to be a warrior and Oscar must be given the ability to use bows. Form a triangle around the target and choose one of the brothers to do the attack. Note: You must see two conversations between the three at your base. Make sure to check the "Info" option frequently.

Bonus maps
Successfully complete the game, then load the "Epilogue" file to play any of the following bonus trial maps after they are unlocked. Your characters will be at the level they were at and have the weapons they had at the end of Story mode. The trial maps are unlocked by completing the indicated task:

Map 1 (Hillside Battle):
Successfully complete Story mode on any difficulty setting.

Map 2 (Lonely Isle):
Successfully complete Story mode on the Normal or Difficult settings.

Map 3 (Strange Turn):
Successfully complete Story mode on the Difficult setting.

Map 4 (Desperation):
Use a link cable to connect to a Game Boy Advance with Fire Emblem or Fire Emblem: The Sacred Stones.

Map 5 (Escape):
Use a link cable to connect to a Game Boy Advance with Fire Emblem.

Map 6 (Trapped):
Use a link cable to connect to a Game Boy Advance with Fire Emblem: The Sacred Stones.

Illustrations
Successfully complete the game to unlock the Fire Emblem: Path Of Radiance illustrations. Use a link cable to connect to a Game Boy Advance with Fire Emblem to unlock the Fire Emblem illustrations. Use a link cable to connect to a Game Boy Advance with Fire Emblem: The Sacred Stones to unlock the Fire Emblem: The Sacred Stones illustrations.

Sound Room option
Successfully complete Story mode to unlock the "Sound Room" option.

Theater option
Successfully complete Story mode to unlock the "Theater" option.