Gai
How to unlock:You must KO at least 1 character with a LDM.

Adelheid
How to unlock:Beat Adelheid in arcade mode.

Unlock Everything
To unlock everything just finish all the challenges in "challenge mode"
Description:How to unlock all the characters.

Adelheid	Defeat him in Arcade Mode when he challenges you
Gai	Defeat him in Arcade Mode when he challenges you
Jyazu	Defeat him in Arcade Mode when he challenges you
Sho	Defeat him in Arcade Mode when he challenges you
Silber	Defeat him in Arcade Mode when he challenges you
Shion	Defeat her in arcade mode. She is the fight befoer Magaki
Shion (alt)	Complete Mission 5
Magaki	Complete Challenge number 6
Robert Garcia	Complete Challenge number 10
Hotaru Futaba	Complete Challenge number 15
Mai Shiranui	Complete Challenge number 20
Tung Fu Rue	Complete Challenge number 25
Ex Kyo Kusanagi	Complete Challenge number 30
Mr. Big Complete	Challenge number 35
Geese Howard	Complete Challenge number 40
Geese Howard (alt)	Fail Mission over 20 times, pause in the middle of the match, and quit

How to choose who challenges you in stage 4
.
On stage 4 in Arcade Mode, you will get challenged by a secret character. The
character that challenges you is determined by how many LDM you land on your
opponent before that, you will get at most 2 LDM usage per stage, so to fight
Jyazu or Silber, you must land all 6. If you meet the requirement for Jyazu and
Silber, the one who challenges you will be random between these 2. This will
help you unlock these character faster.

To fight	Gai Land at least 1 LDM
Sho Hayate	Land at least 3 LDM, no character may die
To fight Adelheid	Fail any of the requirements
Jyazu	Land at least 6 LDM, no character may die
Silber	Land at least 6 LDM, no character may die