Builds below are the easiest builds I have come accross in killing the Doppelganger in Hard Mode.
Necromancer: Kill in 11 seconds
<pvxbig> [build prof=N/Me Curses=12 Domination=12][Pain Inverter][Insidious Parasite][Empathy][Spiteful Spirit][optional][optional][optional][optional][/build] </pvxbig>
Explaination:
Use the skills in the 1-2-3-4 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times. Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. But if you want to kill him really fast use Empathy to do more dmg to him and even less dmg taken. Then if you have the elite Spiteful Spirit, you can simply use this skill for more dmg.
Mesmer: Kill in 11 seconds
<pvxbig> [build prof=Mes/N Domination=12 Curses=12][Pain Inverter][Insidious Parasite][Empathy][optional][optional][optional][optional][optional][/build] </pvxbig>
Explaination:
Use the skills in the 1-2-3 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times.Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. But if you want to kill him really fast use Empathy to do more dmg to him and even less dmg taken.
Warrior: Kill in 15 seconds
<pvxbig> [build prof=W/N Curses=12][Pain Inverter][Insidious Parasite][optional][optional][optional][optional][optional][Flurry][/build] </pvxbig>
Explaination:
Use the skills in the 1-2 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times. Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. But if you want to kill him really fast, add Flurry to the build but do not use it. This will have him attack faster and do less dmg to you.
Monk: Kill in 15 seconds
<pvxbig> [build prof=Mo/N Curses=12][Pain Inverter][Insidious Parasite][Shield of Judgment][optional][optional][optional][optional][optional][/build] </pvxbig>
Explaination:
Use the skills in the 1-2 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times. Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. Use Sheild of Jugement for more dmg if you want another skill.
Ranger: Kill in 9 seconds
<pvxbig> [build prof=R/N bea=12 Curses=12][Pain Inverter][Insidious Parasite][optional][optional][optional][Triple Shot][Dual Shot][Rapid Fire][/build] </pvxbig>
Explaination:
Use the skills in the 1-2 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times. Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. Bring Triple Shot Dual Shot and Rapid Fire for Dopp to use, meaning do not use them yourself as he will die really fast with these skills added. If you want to kill him with a pet bring pet Skills like: <pvxbig> [Brutal Strike][Call of Protection][Feral Lunge][Predator's Pounce][Poisonous Bite][Scavenger Strike][Enraged Lunge][Comfort Animal] </pvxbig>
Dervish: Kill in 11 seconds
<pvxbig> [build prof=D/N Curses=12][Pain Inverter][Insidious Parasite][Armor of Sanctity][optional][optional][optional][optional][Onslaught][/build] </pvxbig>
Explaination:
Use the skills in the 1-2 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times. Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. Can use Armor of Sanctity for more dmg reduction. If you have the elite Onslaught then add it to the bar but dont use it. This will increase his attack rate.
Elementalist: Kill in 15 seconds
<pvxbig> [build prof=E/N Earthm=9 Waterm=9 Curses=12][Pain Inverter][Insidious Parasite][Stoneflesh Aura][Mist Form][optional][optional][optional][optional][/build] </pvxbig>
Explaination:
Use the skills in the 1-2 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times. Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. Bring Stoneflesh Aura for more dmg reduction and/or bring Mist Form to take no dmg.
Ritualist: Kill in 15 seconds
<pvxbig> [build prof=Rt/N Communing=12 Curses=12][Pain Inverter][Insidious Parasite][Dulled Weapon][optional][optional][optional][optional][Weapon of Aggression][/build] </pvxbig>
Explaination:
Use the skills in the 1-2 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times. Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. Hex him with Dulled Weapon to take less dmg. Leave Weapon of Aggression alone as this will be use by him to attack faster.
Assasin: Kill in 15 seconds
<pvxbig> [build prof=A/N =12 Curses=12][Pain Inverter][Insidious Parasite][Flashing Blades][Augury of Death][Dark Escape][Shadow Fang][optional][Critical Agility][/build] </pvxbig>
Explaination:
Use the skills in the 1-2 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times. Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. The Assasin skills I will leave for you to decide which ones you want to bring and what attributes you want to spend them on. Above are useful assasin skills.
Paragon:
<pvxbig> [build prof=P/N =12 Curses=12][Pain Inverter][Insidious Parasite]["Stand Your Ground!"][optional][optional][optional][optional][Soldier's Fury][/build] </pvxbig>
Explaination:
Use the skills in the 1-2 sequence. Once you skip the scene immediatly press the C button to auto target him, then start the sequence. Do not move and do not attack. Keep Insidious parasite on him at all times. Pain Inverter will do the same dmg back at him. Using Insidious Parasite to steal his life and replenish yours. Those first 2 skills alone will kill him. Hex him with Dulled Weapon to take less dmg. Leave Weapon of Aggression alone as this will be use by him to attack faster. "Stand Your Ground!" adds defense while u stand still. If you have shoulders fury then put it off to side so the dop uses it to attack you faster.
NOTE: If you dont have Pain Inverter replace it with Enfeeble