Persona 4 Arena

Successfully complete the game to unlock Teddie and Kanji's story.
Successfully complete the game twice to unlock Naoto, Mitsuru, Akihiko, and Aigis' story.
Successfully complete the game three times to unlock Labrys' story.
Complete the full story with a Persona 3 character and a Persona 4 character to unlock Elizabeth's story.
Complete the full story for Yosuke, Yu, Yukiko, Chie, Kanji, or Teddie to unlock the full story for Mitsuru, Akihiko, AIgis, and Naoto.
Complete Story mode with Labrys to unlock the full story for Yosuke, Yu, Teddie, Chie, Yukiko, and Kanji.

Complete Arcade mode as Akihiko, Chie, Elizabeth, Labrys, Mitsuru, Naoto, Teddie, Yosuke, Yu, and Yukiko to unlock the corresponding person as the round voice announcer.
Complete Arcade mode with Shadow Lab to unlock Rise as the round voice announcer.
Complete Arcade mode with every character to unlock the Ring Announcer as the round voice announcer.

Complete the indicated task to unlock the corresponding navigator.

Aigis
Complete Score Attack mode with Aigis, Labrys, and Mitsuru.

Fuuka
Play 250 online matches.
Alternately, complete Score Attack mode with Yukiko, Akihiko, and Kanji.

Mitsuru
Complete a character's challenge mode.

Nanako
Play 50 hours in match time.
Alternately, complete Score Attack mode with Yu, Elizabeth, Naoto, and Shadow.Labrys.

Teddie
Complete Story Mode.

Yosuke
Do 1000 Instant Kills.
Alternately, complete Score Attack mode with Yosuke, Chie, and Teddie.

Complete the following tasks to unlock PlayStation 3 trophy rewards.

Complete the indicated task to unlock the corresponding storylines.

Elizabeth's story: Get a True Ending from original four characters and a true ending from a Persona 3 character.
Kanji and Teddie's stories: Reach the cliffhanger of the original four characters.
Labrys' story: Reach the cliffhanger for Naoto, Mitsuru, Akihiko, or Aigis
Naoto, Mitsuru, Akihiko, and Aigis' stories: Reach the cliffhanger on Kanji or Teddie.