More is one of the first followers you'll encounter in Metaphor ReFantazio, and the mysterious author has many tasks for you to complete during your journey. These small quests will give you some Imagination and Archetype EXP items, and they're the only way to strengthen your bond with him.
Metaphor: ReFantazio – 17 Things We Wish We Had Known Sooner
More's bond (or Social Link, to borrow the Persona lexicon) levels up as you complete these tasks, much like Margaret in Persona 4 Golden or the twins Caroline and Justine in Persona 5 Royal. Each task advances you to the next rank in Metaphor ReFantazio, so you'll want to complete them all to maximize your bond with him.
If you’re using the Seeker line, Inheritance Slots may be the main reward, but there’s another big prize for completing all of More’s tasks. At rank eight, More activates the Archetype Evangelist ability, which gives you three points toward your Archetype’s bonus stats when active.
More's tasks will largely progress as you go, and you can reasonably complete them all in a single playthrough without jumping through many hoops. If you complete the first task quickly, you may have to wait a while to unlock the Gunner Archetype, but the good news is that you can't miss it.