Popper

 Popper is a virus from the Mega Man Battle Network series. In the beginning of the battle, these viruses are not visible, due to hanging somewhere in the air above the battle field. When this virus begins to attack, it drops down to one of its available panels, unleashing homing wood towers towards the player. It cannot be damaged while in air; only during their attack process are they vulnerable to damage. Popper2 variant is also able to recover its health, if it is hit prior to unleashing its attack (in such a case it will recover instead of attacking).

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. Can recover its health, if hit before it unleashes its attack.

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

Trivia

 * Dropdown and LeafShield are considered to be the hardest chips to obtain in the games that they make an appearance. In order to obtain the chip, the player must S rank the virus that drops it (kill at least two enemies at the same time) within a short period of time. The problem with this is the nature of the viruses in this family; they take a while to drop down and they go back up very quickly, leaving a small window of opportunity for damage. Some also have Recovery chips that they use. Most players resort to the use of the Chip Trader in attempts to obtain these chips.