Familiars
Familiars are collectible companions in DragonSword: Awakening. Hound13 has described them as 'trusty allies and adorable collectible companions' that aid the Hero on their journey across the Continent of Orbis, and they also serve as mounts.
Role
Provide combat support on the world map and in fights.
Act as mounts for traversal once collected.
Collectibility is a gameplay hook; the player is meant to want to collect more of them.
Monetisation
Under Hound13's published post-launch plan, new character costumes and Familiars sit on the store side of the game. See Buy-to-Play Model for how that fits into the Western release's buy-to-play framing.