N.O

 N.O is a virus from Mega Man Battle Network 3. It attacks by sending a copy of itself towards the target in a straight line. If it lands on the target, it deals damage to the target. When it projects a copy, it turns light-blue and has a purple X on the face. The copy is also this color.

N.O-1
 N.O-1 is a white variant with a red X.

N.O-2
 N.O-2 is a yellow variant with a green X.

N.O-3
 N.O-3 is a red variant with a light-blue X.

N.O- Ω
 N.O-Ω is a black variant with a yellow X.