Experiment With Traits
Traits are one of the more confusing aspects of character customization in Shining Resonance Refrain, and they essentially function as titles for characters. The trait you have equipped on each character decides how they interact with other party members during battle, and the Resonance that can take place. Resonances can boost stats temporarily, or cause a variety of other effects. Outside of combing through the game’s tutorials again, the best way to get a feel for how Traits work is simply equipping different ones and seeing what happens.
Generally, Traits that create a green link will be focused on healing and support, yellow links will boost character abilities, blue ones correspond to a rivalry between two specific characters, and a red link can have practically anything happen. Just keep swapping things around and see what happens.
