@Impo: I only mentioned myself and Melon because we're already teamed up and fighting a faction. Khan's, to be precise. 

@Green: I don't think you need to get rid of your faction to keep things interesting. Borderlands 2 was hella fun and that was essentially just four heroes uniting against a common enemy faction. Or in my case, one lonely Siren. :( Regardless, having a faction with limitless fodder and the occasional gaggle of named, tiered characters could work out very well. Though we'd need to find a way to keep from having all the characters involved bogged down and forced to wait for a 1 on 1 duel between one character and a faction enemy.