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Notebook Ninja 2

Online multiplayer. Original co-op play had Nick and Cory falling asleep in Prog Lang. Now that Nick and Cory are on opposite sides of the country, they must fall asleep with a network connection nearby.
Ditch the side-scrolling 2-D style of Notebook Ninja, and go for a more 3-D world. Camera follows player around in a logical manner, and can be moved around by the player. Consider similar style to "Final Fantasy Crystal Chronicles" or "God of War"
Jumping. Will enable jumping attacks.
Ground Vehicles??
Puzzles??

All classic weapons should be included (Stick, Head, Bazooka)
Flail - A torso with a leg and head attached. Stick fighter swings it around his head when idle, and of course slams enemies with it.
Boomerang - Two legs. Thrown forward, and returns to the player. Probably should be weaker than the head, because its an easily reusable projectile.
Mace - A torso with a head attached. Similar to the stick, but more powerful, longer range, and slower.
Scythe - Two sticks together, one becomes the pole and the other is the blade at the end. Allows bloody slashing attacks.
Dual wielding for some weapons??

Sheep. One complaint about the original was that sheep could not be harmed.
Of course, new enemies make it possible to add an even bigger variety of new weapons.