Costumes shop:
Repeatedly and quickly talk to the Prinny at the bottom of your secret base by holding Circle and rapidly tapping X until the confirmation message appears. The costumes shop and the Etna, Laharl, and Flonne costumes will be unlocked.
Alternate costumes:
Unlock the following costumes by performing the corresponding tasks:
COSTUME – HOW TO UNLOCK
Dangerama – Complete the game, attack Darkdeath three times, and watch the ending.
Etranger – Complete the game and watch the ending.
Firo – Defeat Firo on the tenth floor of the “Baccano!” Dengeki dungeon.
Index – Defeat Index at the bottom floor of the “A Certain Magic Index” Dengeki dungeon.
Taiga Aisaka – Defeat Taiga Aisaka on the tenth floor of the “Toradora!” Dengeki dungeon.
G-Darkdeath equipment:
Throw the specified Darkdeath item into the spring that randomly appears inside the dungeon. Note: The spring often appears at Mid-Tier Hero Mastery Cave. You can only use one spring for each piece of equipment, however there is a chance that the item will not be returned.
EQUIPMENT – HOW TO UNLOCK
G-Darkdeath Body – Throw Darkdeath Body into a spring.
G-Darkdeath Head – Throw Darkdeath Head into a spring.
G-Darkdeath Left Arm – Throw Darkdeath Left Arm into a spring.
G-Darkdeath Leg – Throw Darkdeath Leg into a spring.
G-Darkdeath Right Arm – Throw Darkdeath Right Arm into a spring.
Costume effects:
Equip the following costumes to gain the corresponding bonuses:
Disgaea
COSTUME – BONUSES
Flonne – HP 2, SAT -5, LAT 5, SDF -5, LDF -16, SPD 12, JM 15, and water attribute 50%
Etna – HP -2, SAT 8, LAT -15, SDF 5, LDF -16, SPD 12, JM 15, and wind attribute 50%
Laharl – HP 5, SAT 10, LAT -20, SDF 10, LDF -16, SPD 12, JM 15, and fire attribute 50%
Asagi – SAT 4, LAT 10, SDF -16, LDF -16, HIT 24, SPD 12, JM 15, and all attributes 20%
ZHP
COSTUME – BONUSES
Etranger – HP 12, SAT 4, LAT -14, SDF -16, LDF -16, SPD 12, JM 15
Dangerama – HP 5, SAT 10, LAT -12, SDF 15, LDF -2, SPD 10, JM 10, and all attribute -20%
Dengeki
COSTUME – BONUSES
Toradora – SAT 2, LAT 5, LDF -5, JM 15
Index – HP -10, SAT -20, LAT 5, SDF -10, LDF 30, HIT -1, SPD -5, JM 15, and all attributes 50%
Kichi – SAT 2, LAT -5, LDF -5, JM 15
Toru Kitsutaka – SAT 2, LAT -5, LDF -5, JM 15
Kino – HP -10, SAT -5, LAT 10, LDF 10, HIT 5, JM 15
Kirino Kosaka – SAT 2, LAT -5, LDF -5, JM 15
Shana – SAT 5, LAT 5, SDF -5, LDF -5, HIT 4, fire tolerance 50%, and water tolerance -50%
Silver Crow – SAT -17, LAT -5, SDF 20, LDF 10, SPD 20, and all tolerances 30%
Celty – SAT 2, LAT -5, LDF -5
Dokuro – SAT 20, LAT -15, HIT -10, LDF -10, JM 15
Haruka Nogizaka – HP -10, LAT -5, SDF 5, SPD 5, JM 15
Filo – HP 20, SAT 5, SPD 5, JM 15
Boogiepop – SAT 2, LAT -5, LDF -5, JM 15
Horo – SAT 2, LAT -5, LDF -5, JM 15
Momo – HP -5, LAT 5, LDF 10, JM 15
Yoko – SAT 2, LAT -5, LDF -5, JM 15?