Billy (ビリー Birī) is a virus from the Mega Man Battle Network series. Their appearance is that of a ball with eyes, stubby feet, probe-like arms and a lighting bolt protruding out of the back of their head. When in battle, these viruses move around by one panel in random directions. After a set amount of moves, they begin their attack by clenching their thin needle arms and releasing a slow-moving, homming electric ball that floats toward the player for a set duration of time. If hit, they cause the player to be paralyzed for a brief moment and stunned for a bit longer. When stunned, everytime the player moves one panel, their motion is interrupted to deliver a quick shock, dealing 10HP of damage. After a few seconds wandering around after the player, the ball disappears; upon moving a set amount of squares, the viruses repeat this attack pattern. Stronger variants release faster and more damaging electric balls.
Billy family[]
Billy[]

Billy is a variant with yellow colored balls on two feet, with two prongs for arms, and a lightning bolt protruding from their head. They have dark-red eyes.
BillyEX[]

BillyEX is a variant with green colored balls on two feet, with two prongs for arms, and a lightning bolt protruding from their head. They have red eyes.
Billy2/Silly[]

Billy2/Silly is a variant with red colored balls on two feet, with two prongs for arms, and a lightning bolt protruding from their head. They have blue eyes.
SillyEX[]

SillyEX is a variant with blue colored balls on two feet, with two prongs for arms, and a lightning bolt protruding from their head. They have red eyes.
Billy3/Killy[]

Billy3/Killy is a variant with grey colored balls on two feet, with two prongs for arms, and a lightning bolt protruding from their head. They have red eyes.
KillyEX/BillyΩ[]

KillyEX (BillyΩ in Legend of Network) is a variant with pink colored balls on two feet, with two prongs for arms, and a lightning bolt protruding from their head. They have green eyes.
Stats by game[]
Mega Man Battle Network[]
Mega Man Battle Network 4[]
Battle Chips[]

Thunder, known as Thunder Ball (サンダーボール) in Japan, is the series of Battle Chips from Billy viruses. It releases a ball of electricity like the ones released by Billy viruses.
Other media[]
Billys appeared in the MegaMan NT Warrior anime series.
See also[]
Mega Man Battle Network | |
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Main characters | |
Lan • Mayl • Chaud • Dex • Yai • Dr. Hikari • Wily • MegaMan • Roll • ProtoMan • GutsMan • Glyde • Bass | |
Bosses | |
FireMan.EXE • NumberMan.EXE • GutsMan.EXE • StoneMan.EXE • IceMan.EXE • ColorMan.EXE • ElecMan.EXE ProtoMan.EXE • BombMan.EXE • MagicMan.EXE • Life Virus -Optional bosses- WoodMan.EXE • SkullMan.EXE • SharkMan.EXE • ShadowMan.EXE • PharaohMan.EXE • Bass.EXE | |
Enemies | |
Ammonicule • Anaconda • Beetank • Billy • CanDevil • Canodumb • Cloudy • ColdBear • Fanner • Fishy • Flappy Froshell • Gaia • Handy • HardHead • Jelly • Megalian • Mettaur • Miney • Mosqurito • Piranha • Poitton Popper • Prog • Puffy • Ratty • Rush • Satella • Spooky • Swordy • Twisty • VolGear | |
Miscellaneous | |
List of Battle Chips • List of Upgrades • Walkthrough • Script |