Just go, explore. Who being the main doesn't really matter that much, you'll get to see the lore of your companions most of the time. Actually, you'll see more of your companion's past than your own. Even ignoring that, every character has their own lore. So, for maximal exploration/fun, I suggest having 4 origin characters in your party. As for builds, an enchanter, a wizard, a necromancer/summoner, and a random physical damage dealer (ranger/knight/scoundrel) to round it out. Not the strongest party, but the most fun.
