Elements

Just like every other Megaman series, there are weaknesses and strengths to attacks. In the Battle Network franchise, there is a set of elements that are attached to chips and viruses. In MegaMan Battle Network 1,2, and 3, there are 5 elements: Fire, Aqua, Elec, Wood, and null, or no element. If a viruses element was weak against a chip used, the virus will take 2x damage. They would also gain territorial advantages on certain panels. As the series progressed, more elements were added. This was needed because in the 4th and 5th editions of the game (MegaMan Battle Network 4 and 5), the double soul ability that replaced style change requires the sacrifice of a chip of the same element as the double soul being used. This resulted in a total of thirteen elements, though not all of the new elements are in both games. At the end of the series in MegaMan Battle Network 6, there was another change due to the change from Double Soul to Cross Fusion. There are a total of nine active elements, but some chips still have the element icon from the previous games. All the elements and their attributes are listed below.

Fire/Flame
Strong against Wood, weak against Aqua.

Abilities

Wildfire: If a virus or navi is standing on a grass panel, fire attacks do double damage regardless of the attribute of the Navi/virus. (all games)

Lava immunity: Fire attributed Navis/viruses do not take damage from lava panels. (BN 1,2,3,4)

Lava absorb: While using Fire Soul, Megaman will recover 50 HP every time he steps on a lava panel, but this turns the panel back to normal. (BN 4 only)

Sea Damage: Sea panels deal steady damage to Fire-types (BN5 only)

Styles(MMBN 2,3)

A fire attribute style will have the prefix "Heat".

Souls(MMBN 4 and 5)

Fire Soul (Fireman) obtained in MMBN4 Red Sun; Napalm Soul(Napalmman) obtained in MMBN5 Team Protoman.

Crosses(MMBN 6)

Heat Cross (Heatman) obtained in Gregar version; Charge Cross (Chargeman) obtained in Gregar version.

Bosses
 * Fireman.EXE (BN1, BN4 Red Sun)
 * Heatman.EXE (BN2, BN6 Gregar)
 * Napalmman.EXE (BN2, BN5 Team Protoman)
 * Flameman.EXE (BN3)
 * Burnman/Burnerman.EXE (BN4)
 * Blastman.EXE (BN6)

Aqua/Water
Strong against Fire, weak against Elec

Abilities

No Slide: A water attributed Navi/virus will not slide on ice panels (all games)

Sea worthy: Sea panels hide Aqua types (BN5 only)

Moisture Freeze: If hit by an Aqua attack while on an ice panel, a Navi/virus will be frozen and the ice panel will turn back to a normal panel (BN6 only)

Styles

An Aqua attribute style will have the prefix "Aqua".

Souls

Aqua Soul (AquaMan) obtained in MMBN4 Blue Moon; Toad Soul (ToadMan) obtained in MMBN5 Team Colonel.

Crosses

Aqua/Spout Cross (Aqua/SpoutMan) obtained in Falzar version.

Bosses
 * IceMan.EXE (BN1)
 * SharkMan.EXE (BN1)
 * FreezeMan.EXE (BN2)
 * ToadMan.EXE (BN2, BN5 Team Colonel)
 * BubbleMan.EXE (BN3)
 * ColdMan.EXE (BN4)
 * Aqua/SpoutMan.EXE (BN4, BN6)
 * BlizzardMan.EXE (BN5)
 * DiveMan.EXE (BN6)

Elec
Strong against Aqua, weak against Wood.

Abilities

Conductor: When a Navi/virus is standing on an Ice, Metal, or Sea panel, an Elec attack will do 2x damage regardless of the attribute of the Navi/virus. (all except BN6, Sea panels are BN5 only)

Styles

An Elec style will have the prefix "Elec".

Souls

Thundersoul (Thunderman) obtained in MMBN4 Red Sun and MagnetSoul (MagnetMan) obtained in MMBN5 Team Protoman

Crosses

Eleccross (Elecman) obtained in Gregar version.

Bosses
 * Elecman.EXE (BN1, BN6 Gregar)
 * Magnetman.EXE (BN2, BN5 Team Protoman)
 * Flashman.EXE (BN3)
 * Sparkman.EXE (BN4)
 * Thunderman.EXE (BN2, BN4 Red Sun)
 * Cloudman.EXE (BN5)

Wood
Strong against Elec, weak against Fire.

Abilities

Lifeheal: When a Wood attribute Navi/virus stands on a Grass panel, they will regain HP.

Flammable: When a Wood attribute Navi/virus stands on a Lava panel, they take double damage (BN5 only)

Styles

A Wood style will have the prefix "Wood".

Souls

Woodsoul (Woodman) obtained in MMBN4 Blue Moon.

Tomahawksou l(Tomahawkman) obtained in MMBN5 Team Colonel.

Crosses

Tomahawkcross (Tomahawkman) obtained in Falzar version.

Bosses
 * Woodman.EXE (BN1, BN4 Blue Moon)
 * Planetman.EXE (BN2)
 * Snakeman.EXE (BN2)
 * Plantman.EXE (BN3)
 * Tomahawkman.EXE (BN5 Team Colonel, BN6 Falzar)

Null/No element
This element has no weaknesses or strengths.

Abilities

None.

Styles

Normalstyle: The basic Megaman style, no special abilites.

Hubstyle: a style obtainable only in MMBN2.

Souls

None.

Crosses

None.

Bosses
 * Gutsman.EXE (BN1, BN2, BN3)
 * Protoman.EXE (BN1, BN2, BN3, BN6) as null
 * Numberman.EXE (BN1) as null
 * Bombman.EXE (BN1)
 * Colorman.EXE (BN1)
 * Stoneman.EXE (BN1)
 * Magicman.EXE (BN1)
 * Lifevirus.EXE (BN1)
 * Airman.EXE (BN2)
 * Quickman.EXE (BN2)
 * Knightman.EXE (BN2) as null
 * Shadowman.EXE (BN2) as null
 * Cutman.EXE (BN2)
 * Shadowman.EXE (BN2) as null
 * Gateman.EXE (BN2)
 * Bass.EXE (BN2, BN3, BN4, BN5, BN6)
 * Gospel Bug Beast (BN2)
 * Beastman.EXE (BN3)
 * Metalman.EXE (BN3) as null
 * Kingman.EXE (BN3)
 * Desertman.EXE (BN3)
 * Mistman.EXE (BN3)
 * Darkman.EXE (BN3)
 * Serenade.EXE (BN3)
 * Punk.EXE (BN3)
 * Alpha (BN3)
 * Shademan.EXE (BN4, BN5)
 * MegamanDS.EXE (BN4)
 * Laserman.EXE (BN4)
 * Normalnavi.EXE (BN4)
 * Heelnavi.EXE (BN4)
 * Topman.EXE (BN4)
 * Kendoman.EXE (BN4)
 * Duo.EXE (BN4)
 * Gridman.EXE (BN5)
 * Darkmega.EXE (BN5)
 * Cosmoman.EXE (BN5)
 * Nebula Gray (BN5)
 * Elementman.EXE (BN6)
 * Judgeman.EXE (BN6)
 * Circusman.EXE (BN6)
 * G-Beast (BN6 Gregar)
 * F-Beast (BN6 Falzar)
 * Gregar.EXE (BN6 (Gregar)
 * Falzar.EXE (BN6 Falzar)

Recov/Recovery (BN4 and 5 only)
The Recov/Recovery chips are main stays of the series, but these became an element in Battle Network 4 and 5 to provide a sacrifice chip for double souls.

It does not have a weakness or strength, as it is only applied to recovery chips.

Abilities

None.

Souls

Rollsoul (Roll) obtained in MMBN4 Red Sun.

Meddysoul (Meddy) obtained in MMBN5 Team Protoman.

Bosses
 * Roll.EXE (BN4 Red Sun)
 * Meddy.EXE (BN5 Team Protoman)

Invisible/Invis (BN4 and 5 only)
This element was added in Battle Network 4 to the chips "Invis" and "Popup".

It was added to provide a sacrifice for Searchsoul and Shadowsoul. This element has no weaknesses.

Abilities

An Invis element chip will make the user untouchable by non-piercing attacks for an amount of time that depends on the chip used.

Souls

Searchsoul (Searchman) obtained in MMBN4 Red Sun.

Shadowsoul (Shadowman) obtained in MMBN5 Team Colonel.

Bosses

Searchman.EXE (BN4 Red Sun) as Invis

Shadowman.EXE (BN5 Team Colonel) as Invis

Variable (BN4 and BN5 only)
The Variable chips, denoted with +/-, are another of the series mainstays that became an element in order to provide a sacrifice for Numbersoul. It is applied to chips that add effects and damage to chips.

This element has no weaknesses.

Abilities

A +/- element chip will add damage or an effect to a chip selected before it on the custom screen.

Souls

Numbersoul (Numberman) obtained in MMBN4 Blue Moon and MMBN5 Team Colonel.

Bosses

Numberman.EXE (BN4, BN5) as +/-

Ground Cracking (BN4 only)
This element was added to prvide a sacrifice for Guts soul. It was taken out because it had no purpose other than that.

This element has no weaknesses.

Abilities

N/A

Souls

Gutssoul (Gutsman) otained in MMBN4 Red Sun.

Bosses

Gutsman.EXE (BN4 Red Sun) as Ground Cracking

Break/Breaker (BN4, BN5, BN6)
This element was added to provide a sacrifice for Metal soul, but was kept in BN6 as an element for crosses.

This element is weak against Cursor and strong against Sword.

Abilities

SuperArmor: A Breaker attributed Navi/virus will not flinch.

Pierce: A Breaker element attack will pierce armor, guards, and invisibility.

Souls

Metalsoul (Metalman) obtained in MMBN4 Blue Moon

Knightsoul (Knightman) obtained in MMBN5 Team Colonel

Crosses

Groundcross (Groundman) obtained in Falzar version.

Dustcross (Dustman) obtained in Falzar version.

Bosses

Metalman.EXE (BN4 Blue Moon) as Breaker

Knightman.EXE (BN5 Team Colonel) as Breaker

Groundman.EXE (BN6 Falzar)

Dustman.EXE (BN6 Falzar)

Cursor (BN5, BN6)
This element was added in BN5 as a replacement sacrifice for Search soul, since the Invis element was taken by Shadow soul. It replaced the Ground/Ground Cracking element of BN4, and focuses on chips that having homing or targeting abilities.

This element is weak against Wind and strong against Breaker.

Souls

Searchsoul (Searchman) obtained in BN5 Team Protoman

Crosses

Erasercross (Eraserman) obtained in BN6 Grieger

Wind/Air (BN4, BN5, BN6)
This element was added in BN4. It was retained in BN6 for the new cross system, becoming strong against Cursor attribute foes and weaker against sword attribute foes. It focuses on wind or air effects, such as moving objects and/or opponents.

Souls

Windsoul (Windman) obtained in BN4 Red Sun

Gyrosoul (Gyroman) obtained in BN5 Team Protoman

Crosses

Tengucross (Tengu Man) obtained in BN6 Falzer

Bosses

Windman.EXE (BN4 Red Sun)

Gyroman.EXE (BN5 Team Protoman)

Tenguman.EXE (BN6 Falzer)

Sword (BN4, BN5, BN6)
The Sword chips have been part of the games from the very beginning. However, like the Recov chips and the Variable chips, Sword chips did not become a separate element until BN4 with the addition of the Double Soul system. It would retain its element status in BN6, having become part of the Cross Fusion system.

Souls

Protosoul (Protoman) obtained in BN4 Blue Moon and BN5 Team Protoman

Crosses

Slashcross (Slashman) obtained in BN6 Greiger