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Tornado are a class of virus in Mega Man Battle Network which resemble a large industrial fan with wing-like fins. These viruses, despite the apparent presence of legs, remain stationary in battle, and have an odd switch mechanism jutting from their backs. When attacking, these viruses produce a swirling tornado, capable of crossing up to three panels, getting faster and further reach, then double damage with each stronger virus breed. By collecting the Battlechips of each virus, Typhoo n, Hurricane, and Cyclone under the code "G" and adding a Repair chip with the same code, it will trigger a secret Program Advance combination, Death Storm.

Tornado 1
Tornado 1 are red colored fans on four legs. These are the basic and weakest Tornado viruses.

Their whirlwind attack hits up to three panels, homing in on MegaMan, but the virus itself is a sitting duck.

Tornado 2
Tornado 2 are blue colored fans on four legs. They have the furthest range of the Tornado virus family.

Unlike the Tornado 1, their whirlwind attacks have a maximum range of eight panels, and when grouped together, their tandem attacks can be very infuriating to dodge- the overlapping attacks might end up cutting off all possible escapes, or even hit all panels at once.

Tornado 3
Tornado 3 are grey colored fans on four legs. They are the toughest breed of Tornado viruses.

While the Tornado 2 had a range of eight panels, Tornado 3 returns to a range of three panels- but in exchange for this, their whirwind attacks deliver not one, but two hits of damage when the make contact with MegaMan.