So, as a player, putting me on the spot and saying, "You must come as a blank slate, and do all your character creation right now," is a great way for me to end up with a character I'm not really interested in playing, and that probably won't be all that interesting for others to play alongside, either. If you aren't going to give me much time to think about it, how about you just hand me a pre-generated character, and be done with it?
Corollary: if you are playing in the Forgotten Realms, you have to go through literally thousands of pages before you can really grasp what's available.
Well, that's not quite what I was talking about. One way that I've tried to get things going is a really cool (well, to me at least) chargen mini-game using Magic the Gathering Cards. You spread out about ten cards per player (or more, the exact number isn't really important other than LOTS) into a large square. So, presuming 4 players, let's say 49 cards in a 7x7 grid. Taking turns, you each pick one card. You can use anything on that card as part of your character. The picture, the text, anything.
Round 1 - you pick a card that represents you. This is your core identity.
Round 2 - you pick a card for the person to the left of you. That represents your connection to that person.
Round 3 - You pick a card for the person to the right of you. That represents your connection that person.
Round 4 - You pick a card that represents an event in your past. That event can, with discussion, also be connected to either or both the people you are connected to.
Round 5 - You pick a card and give it to anyone at the table, including yourself. This represents something about that character. What it represents is totally up to the person receiving the card.
It's not like it's a totally blank slate anyway. Before Session 0, we've already chosen some sort of campaign. So, everyone's already on board with playing Campaign X, whatever that campaign happens to be. But, I am rather tired of four or five players coming to the table with fully formed PC's, none of which have any connection to each other. I mean, heck, it's not like this is a bizarre concept. FATE games work this way. You can't come to the table in FATE with a fully formed character. It just doesn't work. Loads of games require you to work as a group to create characters and campaign.
Are you saying you could never play a FATE game?