I'm new to the series, but I absolutely adore the Pair Up function. It's fun stacking the odds in your favor, increasing the chances of a blocked hit or follow-up strike, not to mention the stat buff and how it simply looks cool seeing two cherished characters fight side by side. And of course, you reap narrative benefits in the form of the Support convos, through which you can wed off characters to unlock paralogues where you can recruit their children (with hair colors and skill sets unique to the combination of parents).