I'd like to have the ability to choose my character's own personal backstory (similar to Dragon Age Origins, Mass Effect and Mount & Blade), so that there would be many possibilities for how players react to the world (ideologically speaking) and vice-versa. I'd also would love the ability to choose their political and religious preferences (it of course wouldn't be shoved all in the players or NPCs faces throughout the game, but there would be subtle moments in cutscenes or random dialogue that expresses how they feel about a certain topic), Leftist (Liberalism, Communism, etc), Far-Leftist (Anarchism, Radical-Communism, etc), Rightist (Conservatism, Nationalism, etc), Far-Rightest (Hardcore-Conservatism, Ultra-nationalism, etc), Christianity, Catholicism, Shintoism, Sikhism, Buddhism, Islam, Deism, Agnosticism, Atheism, etc.
And don't just let us play with different Roles and let players feel as though it was somehow the same as the last one they toyed with, let each one feel unique to us (let Nomads rise from the gutter, Corporates being part of a huge Corporations, etc). Or heck, let us even choose our own personal backstories with each role, just like Dragon Age Origins (just so we'd have a fresh new experience almost everytime we play).
That's how I'd want it anyways, just so we can all truly have our own unique characters (some born rich, while others poor, some religious, while other more secular, etc). Though I will also add that some political views shouldn't be made available to Corporates (it wouldn't make much sense for a Radical-Communist or a Anarchist to be what they deeply hate, logically speaking).