The Bond you build between characters in Rise of the Ronin can create romances, unlock side quests, and more. Gifts are the best way to deepen the relationships you have with your favorite companions, allowing those allies to give you access to new gear, weapon styles, and even skill points. The right items presented to various characters will let their Bond with you grow much faster as your journey continues.
https://screenrant.com/rise-of-ronin-best-gifts-for-each-character/