Amazon
Javazon: Focus on Javelin tree
Lightning Javazon: Charged Strike & Lightning Fury as main attacks
Plagazon/Poison Javazon: Plague Javelin as main attack
Fearazon: For fun, combines Lightning Strike & "hit causes monsters to flee".
Bowazon: Focus on Bow & Crossbow tree.
Physical Bowazon: Straff & Multi-arrow as main attacks.
Ice Bowazon: Freezing Arrow as main attack
Fire Bowazon: Immolation Arrow as main attack.
Angelzon/Proc'azon: Straff as main attack, gear with CtC on attacking.
Jabber: Focus on Jab ability.
Physical Jabber: Jab as main attack.
Lightjab: Jab and Lightning Fury as main attacks.
Fendazon: Fend as main attack.
Impale zon: Impale as main attack.
Valkazon/Tankyrie: Maxed Valkyrie as tank, supported with a bow or a javelin.
Passivezon: : use only the Passive & Magic tree.
Fuzzy Dodger/Bearazon: : Werebear (from Beast) with maxed dodge skills.
Daggerzon: Dagger was main weapon for a good block rate
Tankazon/Palazon Battlemaid: Zeal (from Passion) or Vengeance (from Kingslayer) as main attack.
Hybrid/Fishyzon: use both a javelin and bow ability trees.
Assassin
Trapper/Trapsin: focus on Traps tree.
Light Trapper/Shockbringer: Shockweb & Lightning/Death Sentry as main attacks.
Fire Trapster: Fire Blast & Wake Of Fire as main attacks.
Bomber/Bombasin: Fire Blast & Shockweb as main attacks.
Bladesin/Furysin/Blademaster: use Blade Fury as main attack.
Melee: focus on Martial Arts tree. All builds can be made hybrid with some traps.
Shadow Knight: Zeal (from Passion) as main attack.
Bearsin: Werebear form (from Beast).
Classic: damage oriented gear.
Ursa-Major: max attack speed oriented gear.
Martial Arts:
Kicker: focus on Dragon Talon, Tail or Flight.
Mageslayer: Dragon Talon as main attack to slay casters in PvP.
Physical/Fire Kicker: Dragon Tail as main attack for physical & AOE fire damages.
Rift-a-sin/Riftkicker/Riftkick Assassin: maximum attack speed and gear with CtC on attack (from Rift). Use Dragon Talon for attack speed.
Firedancer: kick & fire traps hybrid.
Flashdancer: kick & lightning traps hybrid.
Tiger Striker: Tiger Strike as main attack.
Vampire: Cobra Strike as main attack.
Phoenix Striker/Monk/Tankasin: Phoenix Strike as main attack.
Cold Maiden/Ice Ninja: Blide of Ice as main attack, or Phoenix Strike 3rd charge.
The Immobilizer: Blade of Ice & Dragon Tail as main attacks.
WWSin/Whirlwind Assassin/Shredsin: Whirldwind (from Chaos) as main attack.
Hybrid: use Whirlwind as main attack & lightning traps for support in PvM, Fire Sentinel for mindblast-lock in PvP.
Bramblesin: poison damage oriented gear (Venom boosted from TO gloves & Bramble).
Ghostsin: focus on physical & mind blast for crowd control.
Elephant: total damage oriented gear (with precast stuff like Bramble, Demon Limb, ...)
Bowasin: a bow with Exploding Arrow or Guided Arrow as main weapon, Venom for damage boost.
Barbarian
Melee:
Double Swing Barbarian: use Double Swing as main attack.
Frenzy Barbarian: Frenzy & Double Swing as main attacks.
Classic: damage oriented gear.
Executioner: gear with priority to mods: crushing blow, open wounds...
Zerker: Berserk as main attack.
Concentrator: Concentrate as main attack.
WW Barb/Whirlwind Barbarian: Whirlwind as main attack.
Classic: damage oriented gear.
Spear Barb: use a spear for a better attack range.
Poison Barb: get damages from tons of poison small charms.
Wolfbarb: Werewolf form (from Wolfhowl). IK set can be used for good killing speed.
Classic: damage oriented gear.
Canis Major: attack speed oriented gear.
Bearbarb: Werebear form (from Beast).
Zealbarb/Zeal Barbarian: Zeal (from Passion) as main attack, Weapon Mastery for damage boost and warcries for tanking.
Frozen Orb barb: use Rift & Voice of reason with Frenzy/Double Swing as main attacks to proc frozen orbs.
Ranged:
Thrower/Double-Throw Barbarian: Double Throw as main attack.
Bowbarb/Mangudai: a bow with Exploding Arrow, Guided Arrow or Crushing Blow as main weapon.
Caster:
Leaper:
Dragoon Barbarian/Flying Booyaka: Leap Attack as main attack.
Pacifist: Leap as main attack, support only.
Horker/GF Barbarian:
Singer: War Cry as main attack.
Taunt barb/Taunter: use Taunt as main attack to make all ennemies totally harmless (90% damage reduction).
Mockinngird: a Taunter with Frenzy as secondary attack.
Piper: a Taunter with Warcry as secondary attack.
Jester: a Taunter with Berserk as secondary attack.
Pacifist/Sitting Duck/Punching Bag/Nonviolent Protester: a Taunter with Berserk as secondary attack to weaken its own defense, and gear with CtC high level spells on struck to kill ennemies.
Fireball barb: Fireball (from 2 TO pieces) as main attack.
Dropbarb: for fun & MF farm only, use Find Item as main attack.
Flamebellow barb/Infernobarb/Balrog: use Inferno (from 2x Flamebellow) as main attack.
Barbarian Mage: use 3 pieces of TO to get Fireballs, and only warcries & passives skills as support.
Druid
Bear: use Werebear form.
Classic: use Maul as main attack with a damage oriented gear.
Kodiak: use Hunger as main attack with an attack speed oriented gear. Unfortunately a fix from 2011 nerfed the bear Hunger's max attack rate 4 frames to 8 frames because of a Hunger animation bug.
Classic: use only Hunger.
Mauler: charge Maul before using Hunger.
Armageddon: cast Armageddon for additional damages.
Fireclaw: use Fire Claw as main attack.
Shockbear: use Shock Wave as main attack.
Wolf: use Werewolf form. Builds may be hybrided with 2 main attacks.
Fury: use Fury as main attack.
Classic: damage oriented gear. IK set is a good low budget gear for that.
Proc: use items with CtC on attack to proc synergized skills.
Tornado: use Stormlash, Horizon's Tornade or Rift as main weapon.
Twister; use Windhammer as main weapon, and optionally 1-2 Carrion Wind rings.
Firestorm: use Phoenix weapon and/or shield.
Volcano: use Doom as main weapon.
Volcano/Firestorm: use Doom as main weapon and Phoenix as shield.
Rabies: use Rabies as main attack.
Fireclaw: use Fire Claw as main attack.
Elemental: focus on Elemental tree.
Wind Druid: use Tornado & Hurrican as main attacks.:
Fissure Druid: use Fissure as main attack.
Bowler: use Molten Boulder as main attack.
Huntermentalist/Shaman: use any fire skill as main attack, and summons for support.
Flamethrower: use Firestorm as main attack, and Grizzly for tanking.
Summon: focus on Summon tree.
Classic: caster gear.
Hunter: use a bow as main weapon to supports the summons.
Necromancer
Summoner/Summonmancer/ZooKeeper: focus on Summon tree.
Classic/Skellimancer: use all summon types.
Fishymancer: summon only normal Skeletons and use Corpse Explosion as main attack.
Lord of Mages: summon only Mage Skeletons & a fire golem.
Returnomancer: use Revive only.
Stabbing Summoner: use summons & maxed poison dagger as a finisher/boss killer.
Pregnant Egg Laying: for fun only, use revive on act 2 or 4 Maggots. They will lay eggs that are hostile to you and your party, and will hatch into normal ennemies and can PK.
Golemancer: summon only golems.
Blood Golem & Iron Maiden: use Blood Golem, a few summons or walls, and kill with Iron Maiden.
Fire Golem Exploder: get a strong Fire Golem, and kill with Corpse Explosion
Poison:
Daggermancer: use Poison Dagger as main attack and Poison Nova/Explosion as secondaries.
Venomancer/Novamancer/Poison Nova: use Poison Nova as main attack. Caster gear.
Bonemancer/Artymancer (Arty for Artillery):
Dentist: use Teeth as main attack.
Spearmancer: use Bone Spear & Bone Spirit as main attacks.
Jailer/Jailkeeper: use only Bone Wall & Bone Prison, and kill with Iron Maiden. Caster gear.
Bow Bonemason/bowmancer: use a Brand crossbow as main weapon to cast synergized Bone Spears.
Bowmancer: use Demon Machine crossbow as main weapon, Bone Prison/Wall & thorn act2 mercenary & iron maiden as secondary attack.
Curse Necro/Mojomancer: use only curses.
Meleemancer: a melee necromancer.
Classic: max Bone Armors for tanking, use Zeal (from Passion) or Vengeance (from Kingslayer) as main attack. Use curses for crowd control & enhanced damages.
Poison Dagger: use Poison Dagger as main attack.
Commandomancer: hybrid of meleemancer with a few summons.
Bearmancer: use Werebear form (from Beast).
Classic: damage oriented gear.
Commandobearmancer: hybrid with a few summons.
Bone Bear/Bonemason/Bone Proc' Necro/CTC Bear Necro: use Brand, Bonehew or Oath as main weapon to proc synergized Bone Spears.
Bonemason/Acrid Axemancer/Poison Proc' Necro: use Brand, Breath of the Dying, Andariel Visage & Carrion Wind for CtC a synergized Poison Nova. Use Bone for automatic armor cast. Often use Revives too.
Throwmancer: use Throw-weapons as main attack, and a Jailer strategy.
Fireball Necromancer: use 3 TO pieces or full set, and Fire Ball as main attack, with Lower Resistance curse.
Paladin
Melee:
Zealot: use Zeal as main attack.
Fanatic: use Fanatism aura.
Elemental: use gear with high elemental damages.
Tesladin: use Holy Shock aura.
Freezadin/Frostadin/Frost zealer: use Holy Freeze aura.
Slowadin: for support, a Paladin focusing on slowing ennemies: Holy Freeze, CtC Decrepify (from Lawbringer), gear with slow percentage, and optionally Clay Golem.
Pyromaniac/Fire auradin: use Holy Fire aura, or Hand of Justice & Double Dragon & Conviction aura.
Convictionist: use Dual Dream to get level 30 Holy Shock aura, Conviction as main aura.
Procsdin: fast attack speed with zeal/fanatism, and gear with CtC on attacking.
Vindicator/Smiter: use Smite as main attack, and Fanatism or an elementary aura.
Crusader/Charger: use Charge as main attack, and Fanatism aura.
Avenger: use Vengeance as main attack and Conviction or Fanatism aura.
Martyr/Iron Martyr: use Sacrifice as main attack, and Fanatism aura.
Pallybear: use Werebear form (from Beast)
Thorn/Conversion: a Paladin who use Thorns with Conversion to make return all damages dealt to himself or turned monsters. Not verified, but it seems it you can kill your party members with it lol.
Caster:
Hammerdin: use Holy Hammer as main attack, and Concentration aura.
Templar/Foher: use Fist of Heaven as main attack, and Conviction aura.
Cleric: use Holy Bolt as main attack, Prayer & other auras for party support.
Justifier: a Cleric that uses Smite to kill non-undead ennemies.
Reflector/Savior: for support only, use auras to heal/protect your party.
Medic/Healer/Acuponcturer: for support only, only use Prayer, Holy Bolt, Cleansing & Meditation.
Fire pally: use gear to cast Fireball or Hydra.
Tridin: a tri-element paladin, using Zeal with Rift or Voice of Reason to proc Frozen Orb, Foh, and Fireball from 3 TO pieces. His main aura is conviction.
Abbot: for fun, an undying paladin with gear focused on damage reduction/absorb, and Prayer aura to outhealing the received damages.
Ranger: use a bow with Exploding Arrow, Guided Arrow or Crushing Blow as main weapon..
Fanatic: use Fanatism aura.
Freezer: use Holy Freeze aura.
Tesler: use Holy Shock aura.
Pyromaniac: use Holy Fire aura.
Hybrids:
V/T: use Smite as main attack & Fist of Heaven as secondary.
T/V: use Fist of Heaven as main attack & Smite as secondary.
V/C: use Smite as main attack, and Charge as secondary.
C/T: use Charge as main attack, and Fist of Heaven as secondary.
Mage: use Hammer as main attack, and Fist of Heaven as secondary attack.
Daydreamer: use Fist of Heaven as main attack, and Holy Shock as aura.
Vanquisher: use Hammer as main attack, and Smite as secondary.
Liberator: use Hammer as main attack, and Charge as secondary.
Judicator: use Charge, Blessed Hammer & Fist of Heaven.
Sorceress
*Note: Most of the builds have a Vitality variant and an Energy Shield variant.
Fire
Fireball/Meteor: use Fireball as main attack, and Meteor as secondary.
Inferno/Dragon: use inferno as main attack.
Blaze/Blazebabe: use Blaze as main attack.
Blaze-wall: use Blaze and Fire Wall.
Enchantress: for support only, enchant the party. Particularly usefull for low level players.
Lightning
Lightning/Chain-Lightning: use Lightning & Chain Lightning as main attacks.
Nova/ES: use Nova as main attack, and Energy Shield as defense.
Charged Bolt/chargedboltress: use Charged Bolt as main attack.
Ice:
Blizzard: use Blizzard as main attack, Glacial Spike for crowd control, and Ice Blast as secondary.
Frozen Orb/ES: use Frozen Orb as main attack, and Energy Shield as defense.
Barrier: win PvP with a maxed Shiver Armor, and Frozen Orb as secondary attack.
Bi-element: hybrid of two element trees
Firewall/Orb: use Frozen Orb as main attack, and Fire Wall against immunes.
Meteorb: use Frozen Orb as main attack, and Meteor against immunes.
Hydra/Orb: use Frozen Orb as main attack, and Hydra against immunes.
Blizzard/Fireball/Blizzballer: use Blizzard as main attack, and Fireball against immunes.
Chain-Lightning/Hydra: use Chain Lightning as main attack, and Hydra against immunes.
Static/Orb: use Frozen Orb as main attack, and Static Field & your mercenary against Immunes.
Enchantless: use items with enchant charges to buff merc & team, fire mastery & warmth to synergize it. And most of the skills points in an attack spell: Blizzard, or Charged Bolt+Nova, Nova+Lightning or Lightning+Chain Lightning.
Enchant/Orb: use Frozen Orb as main attack, and Enchant to buff mercenary and party.
Tri-element: hybrid of the three element trees
Charged Bolt/Nova/Frozen Orb/Firewall: Frozen Orb as main attack, other attacks against immunes & bosses.
Melee:
Zeal/Zealchantress: use Zeal (from Passion) as main attack, Dual Dream with Lightning Mastery for high damages, Enchant for attack rate, and Energy Shield as defense.
Bear: use Werebear form (from Beast).
Lightning/Fire: use Dual Dream with Lightning Mastery for high damages and Enchant for attack rate.
Fire/Hydra'proc: use Dual Dragon to proc hydras and for high fire damages, and one Dream for additional damages.
Ranged sorc: use a bow or crossbow as main weapon
Bow enchantress: Demon Machine fires Exploding Arrows. Enchant (and optionally Holy Fire from Dragon Armor) with Fire Mastery boosts damages, and Enchant also boosts attack rate. Frozen Orb can be used as secondary timed attack.
Bow sorc: use Harmony charges to revive minions, and Enchant them for better damages.