A few mechanics that were released in Disgaea 3: Absence of Justice are re-used in the PSP version of Disgaea 2.
Magichange
Magichange is Disgaea 2: DHD's greatest feature, recycling from Disgaea 3. Any allied monster can transform into a weapon for a human ally to use. Different monsters have different transformations. (Marionettes can become Bows, Dragons can become Spears, ETC.) A monster's Magichange type can be shown under it's status summary. This feature can only be used during Axel Mode, and can only be used in the main story AFTER clearing Axel Mode. This addition allows the the technique of towering characters to receive felonies for all of them to be extended to multiple monster characters, by having them magichange with a character being thrown into the court gate.
Toss & Throw
Although Monster classes cannot lift and throw characters,they can toss thrown units further. If a Human ally throws a unit at an allied Monster, the thrown unit will be bounced further in the direction the Monster is facing. (EX.: A Mage throws a Witch at a Saber Kitty facing to the Mage's right, the unit will be bounced 5 panels to the Kitty's right.) A monster's bouncing diameter is shown in its "TM" on its status menu.