All characters
Type LF2.NET in character selection screen to get all characters and difficlty CRAZY!

Get Firzen
if freeze and firen run into each over they will turn to firzen and
and a big artic volcano will appear,
the player that controlled firen will control firzen
they must have less than 33% life and be in one team.

Get LouisEX
press Defense Jump and attack to turn to LouisEX, it will couse shockwave to all nearby players and his armor will fall off.
you must have less than 33% to do this.

Get Bat
if you are playing with Rudolf you can get Bat if you will transform to him at stage 5 at the stage mode.
you can do the same to other characters to get them too.

get the guide to all moves at http://www.netfront.net/~marti/lf2/guide_v19.exe