People have long been speculating how the Followers system will work in the Diablo 3, and if they would interact with Diablo 3 cheats. Speculation is no longer necessary, as Blizzard has released both a video offering a sneak peak of it, as well as a more in depth interview with Jay Wilson and Leonard Boyarsky detailing the system.
The core of the Diablo 3 followers system will work similarly to Diablo 2, but things will be expanded greatly.
There are three types of followers to choose from, The Enchantress, the Templar, and the Scoundrel. Each of these three types of followers comes with their own style and their own unique set of skills. Your follower will level up just as you do, and will unlock a new skill (your choice of three) every fifth level until they reach level 20. Really, your follower is like a mini-character of its own, complete with skills, items, levels, experience earning, etc.
The three different types of followers mirror the typical three types of characters you see in a dungeon crawling RPG like Diablo. The Enchantress is the magic character, your basic wizard or sorceress. She has spells like disorient, force push, energy bomb, decoy, etc. The Scoundrel is your typical ranged fighter, or what some games call a “thief”. He’ll let you do the tanking and will himself focus on dealing damage from a far. The skills that you can learn for him include things like crippling shot, vanish, rapid shot, power shot, etc. Lastly, we have the Templar, who takes on the role of a typical tank/melee fighter/soldier. Charge, heal, protection, and other similar skills are the type you’ll be picking from every five levels with him.
Each of these followers will actually be characters with their own backstory, quests, etc. In order to gain their trust and get them following you, you will have to help them with their own personal quests instead of just focusing on your own. The Templar is named Kormac, the Scoundrel named Lyndon, and the Enchantress is named Eirena. Of the three, Eirena will leave you the most skeptical of her intentions, for she is not all good and has a sketchy quest and a checkered past.
Followers will only join you when you are playing the game single player. If you add another partner to co-op with, the followers will leave (though they will automatically re-join you if all your human partners leave). Things would just get too chaotic with several human players each with their own set of followers on the screen, so Blizzard has set followers up to be an alternative to human allies, not an addition to them.
Followers also differ from your typical RPG squadmates in that you will have no control over them. When I say no control, I mean literally zero control. You will not be able to tell them whether to be aggressive or passive, or tell them to cast a spell on a certain character or enemy. All of this will be handled by the game’s AI, which Blizzard claims is very advanced and will play the game just as a good human player would.
One last note about followers before I wrap this up is that they will continue to level up regardless of whether or not they are in your party. So if you don’t want to use followers (or are playing the game multiplayer) and later want to add them or switch to single player, you will not have missed out on anything by not having used your followers much before. This ensures that Diablo 3 can really be a drop-in/drop-out co-op experience without making to have you worry about missing out on any single player goodies when playing with friends.