I have completed everyone's first Chapter aside from Ophilia, who I'm about to pick up. Still getting to know everyone, but I've been sticking with Olberic, Therion and Cyrus for most of my gameplay so far. I've swapped Tressa out a few times when encountering a new character, but I like her in my party. H'aanit (the last character I picked up) has an interesting mechanic though with her beast taming system. I might bring her in after I complete Ophilia's opening story.