While playing with Star Renegades, you will have the opportunity to camp for the night. Before doing so, be sure to explore the open regions for any bonuses, items, or heals you may have missed. After that, press the Camp button and you can start working on your character's relationships.
If you click on each character, you will see that they have a certain number of cards available to play, but the whole team draws from the same pool of points. Cards will have a cost, and that cost will then be subtracted from the global pool.
Each card will have a certain effect, for a set duration, such as increasing shields, healing an ally, or increasing their damage. Having a character use a card to help another character will increase their relationship rating. The closer the two characters are, the better they will fight together, eventually opening up Combos and Fury attacks that they can perform in unison.
It's a good idea to focus on pairs of fellow combatants, do what you can to bring them together, and choose characters who have skills that complement each other.
To perform Fury attacks, you need to land Crits on enemies by attacking them before they attack you, and smash them by shifting them until the end of the timeline. Credits will earn a single Fury Point, and Breaks will earn three Fury Points. You can then spend these Fury Points on Combos between your characters. The closer they are, the more damage they will take with a combo attack. For a full description of the intricacies of combat, be sure to read our helpful guide.
Eventually, characters can have relationships that go beyond simple friendship, but we haven't had enough time in the game to find out who the best couples are still. We will expand on this information after a little more time in the game.