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Tornado are a class of virus in Mega Man Battle Network which resemble a large fan. These viruses, despite the apparent presence of legs, remain stationary in battle. When attacking, these viruses produce a moving tornado, capable of moving up to three panels.

Tornado1
Tornado1 are red colored fans on four legs.

Tornado2
Tornado2 are blue colored fans on four legs.

Tornado3
Tornado3 are grey colored fans on four legs.