Popper

 Popper is a virus from the MegaMan Battle Network series. It is invincible until it drops down from wherever it hides and attacks. They attack with homing wooden spikes.

Popper
 Poppers are yellow bagworms inside a brown pinecone, with a green hat, hanging on a grey strand.

Popper2
 Popper2s are light-brown bagworms inside a red pinecone, with a brown hat, hanging on a grey strand.

Popper3
 Popper3s are pale bagworms inside a green pinecone, with a blue hat, hanging on a grey strand.