How do you put together you team for going through the main game?

Do you just level up your starter and use him for everyting? Do you have a full team of six planned out before you start the game? Do you just go in blind and wing it, even on replays? Or something else? Do you pick based on what's good, which ones are your favorites, which ones you can get early and use the whole game, etc.

Give me all the details. Post your latest teams too if you want.