Octon

Octon, known as Takobaru (タコバル) in Japan, is a virus from the Mega Man Battle Network series. It is a stationary octopus-like virus that shoots explosive balloons out of its mouth. The balloon starts at a set damage. The more damage done to it before it explodes, the more the damage of the blast will increase. When it blows up, it will damage all panels of the side it's on.

Octon
Octon is red and light-blue. They shoot out blue bubble bombs. Their bubble bombs start at 50 damage.

Octor
Octor (タコバリン Takobarin) is green and yellow. They shoot out yellow bubble bombs. Their bubble bombs start at 100 damage.

Octovian
Octovian (タコバレー Takobarē) is blue and orange. They shoot out red bubble bombs. Their bubble bombs start at 150 damage.

Battle Chips
Aqua Balloon (アクアバルーン), Elec Balloon (エレキバルーン) and Heat Balloon (ヒートバルーン) are the Battle Chips from Octon viruses. It creates a balloon that slowly flies forward and explodes in contact, causing elemental damage in all panels of the side it popped. Its standard damage is 10 HP, which increases when attacked before touching an enemy. The balloon will disappear if it doesn't touch an enemy before going off-screen.