Disgaea 2: Dark Hero Days/New monsters

Saber Kitty
Saber Kitties were originally a monster class in the NIS title "Makai Kingdom: Chronicles of the Sacred Tome." These are unlockable at the start of Axel Mode. Their ATK power increases based on how many soaces they have moved. Therefore, outfitting a Saber Kitty with Shoes is a good move for new players.

Wyrm
These monsters were originally classes in Disgaea: Hour of Darkness and it's remakes. They specialize in pure strength and ATK power.