Quaker

 Quaker is a virus from Mega Man Battle Network 3. It jumps up and causes a shockwave on the same row as the panel it lands on. It can even crack panels.

Quaker
 Quaker is a black and gray variant with a red bandana.

Shaker
 Shaker is a brown and light-blue variant with a green bandana.

Breaker
 Breaker is a green and yellow variant with a purple bandana.

QuakerΩ
 QuakerΩ is a brown and blue variant with an orange bandana.