Teen Titans

Characters are unlocked in multi-player mode as you progress in story mode:
Apprentice (Hero)       : An alternate version of Robin,
Beast Boy (Hero)        : Teen Titan capable of shape-shifting into animals,
Blackfire (Villain)     : Starfire's sister; plays exactly like Starfire,
Blocker (Henchman)      : Robotic fighting machine,
Bumble Bee (Hero)       : Uses powerful twin lasers,
Bunnyguard (Henchman)   : Mumbo Jumbo's bodyguard,
Cinderblock (Villain)   : Made of concrete and stone, strongest
                          character in the game,
Clown Beast Boy (Hero)  : An alternate version of Beast Boy,
Control Freak (Villain) : Attacks with a variety of sci-fi gadgets,
Cyborg (Hero)           : Part-robot with enormous strength,
Cyclone (Hero)          : An alternate version of Cyborg,
Dr. Light (Villain)     : Uses the power of light to attack,
Fang (Villain)          : Plays the same as Gizmo in his mecha-spider,
Gizmo (Villain)         : Attacks with mechanical contraptions of
                           his own design,
Hive Soldier (Henchman) : Works for the Hive Academy, a school for ervillains
Hotspot (Hero)          : Uses powers of flame to attack,
Jinx (Villain)          : Jinx's powers of bad luck are translated into
                           powerful energy attacks,
Mad Mod (Villain)       : Wears an exoskeleton designed after the
                           London Royal Guard,
Mammoth (Villain)       : Uses his great strength to defeat his enemies,
Mega Meaty Meat Beast Boy (Henchman) : An alternate version of Beast Boy,
Mumbo Jumbo (Villain)   : A diabolical magician,
Plasmus (Villain)       : Blob monster army leader encountered
                           during story mode
Plasmus Kid (Henchman)  : A fighting blob monster,
Raven (Hero)            : Fights with ranged telekinesis attacks,
Red Raven (Hero)        : An alternate version of Raven,
Red X (Villain)         : Robin's alter-ego come to life,
Robin (Hero)            : Acrobatic melee fighter,
Slade (Villain)         : Arch-enemy to the Teen titans, clever fighter,
Slade Minion (Henchman) : Generic foot soldier in the employ of Slade,
Speedy (Hero)           : Attacks with bow and arrow,
Starfire (Hero)         : Powerful ranged beam attacks,
Tempest (Henchman)      : Robotic fighting machine,
Terra (Hero)            : Geomancy powers let her attack with rock
                           projectiles and landslides,
Trigon (Villain)        : Raven's demon father fights with flame attacks
                           and powerful punches,
White Raven (Hero)      : An alternate version of Raven,
Wildebeest (Hero)       : Powerful man-beast.

Multiplayer Mode Characters:
All you have to do is just play through Story Mode and eventually
unlock characters.

Multiplayer Mode Stages:
Just play through Story Mode to unlock Multiplayer Mode Stages.

Unlockable Arenas:
City Cathedral  - Complete City Night Showdown Level
Larry's World   - Complete Danger Yard Level
Mad Mansion     - Complete 1st part of Jail of Horror Level
Mumbo's Big Top - Complete 2nd part of Magic Mayhem Level
The Hive        - Complete Hive Academy Level
Raven's Mirror  - Complete Thriller Driller Level
Sky Needle      - Complete Titan Tower Level
Titan Tower     - Complete Slade Ambush Level
Slade's Lair    - Complete Final Clash Level

 