Warlock Pets
From Basin Wiki
General Pet Overview
Imp
The spell damage pet. Not used as much when going affliction. Improved Imp can do a lot of damage but one of the points of full affliction is using dark pact, and the Imp will burn through its own mana casting bolts leaving little for you to take. Where the Imp is used though is in partying. Place him on passive and with the new phase shift ability you have a protected mana battery. The stamina buff and fire shield are great party buffs.
Voidwalker
The tank pet. One of the boons of the VW is the ability to grab aggro from adds which gives time to apply DOT's. An affliction specced warlock can tank through fights using drain life but to do that, he want the dot's already applied so he can spend time regaining life. VW gives the time to do that better than any other pet, especially when there are 2 or more total mobs.
Succubus Succubus Picture (Old Style)
The melee damage pet. With Lash of Pain adding damage, Sooting Kiss reducing aggro, and Seduce for humanoid CC, she's very formidable. While the Voidwalker is useful for multiple enemies, against singles, she is much more effective. A warlock will usually pull aggro off of his pet even if he has a Voidwalker out - the increased damage just means he will kill much faster. Seduce adds in an anti-gank factor on PvP servers, allowing you to seduce ambushers and run away (or set up for a kill).
Felhunter Felhunter Picture
The anti-mage pet. Mostly only useful in PvP, the felhunter has a counterspell and dispell (offensive and defensive) at his disposal. A well played warlock with a felhunter out should have little problem with casting classes in PvP.
