Five Diablo playable classes have been announced so far and they all offer different versions of the previous games. Each installment has introduced something new and exciting, maybe Tyrael could become an element of the battle and help balance the sides by offering players the ability to be transformed into angels or demonic powers , in exchange for responsibilities to Sanctuary. This kind of system could be a natural progression from the multi-tree expansion that was previously made public for the series Diablo IV Gold.
It's unlikely that Blizzard intends to turn Angels as well as Demons into classes, given that the franchise focuses on people who are caught between the two. As the only mortal trapped between Heaven and Hell Tyrael occupies the most unique position in the entire Diablo history. He will more likely be playing a role of balance throughout the story, and maybe even a voice of reason instead of being a party player like previously. Although he may be forced to take positions, Tyrael understands the value of mortals and that's why he'll most likely be a part of the events of Diablo 4.
The method used by Blizzard to specify the character of Diablo 4 is a blend of the Studio's approach to Diablo 2 and Diablo 3. The executive producer and head of the Diablo franchise Rod Fergusson put it, "Diablo 2 was like locking yourself in; you had the ability to respec at least once per difficulty. However, with Diablo 3, you sort of changed your build like you would change your clothes. Everything was gear-based as opposed to skill-based."Fergusson added, "I think the fact that we have skills on the equipment [in Diablo 4] is really nice for experimentation -- as a sorceress I [might] get Blizzard [on a pair of boots] three levels before I should and I can try Blizzard to see if I actually want it."
Game Director Joe Shely told Polygon in an interview with a roundtable the idea of "having your character appear to be a collection of choices you've made will lead to intriguing choices, or at least intriguing opportunities."Shely added that the Diablo group is conscious that the players especially in the beginning, don't know the full extent of the different classes' capabilities. They will be looking to test their skills buy Diablo 4 Gold.