Erik and Mia, while not directly customizable in terms of stats, possess unique Fortes and combat roles that are essential to your success. Their primary abilities include:

- Slingshot: Used for ranged attacks, stunning enemies, or activating distant switches. Different ammo types (e.g., healing pellets, elemental pellets) can be crafted or found.
- Fortes: Erik and Mia each have unique Fortes. Erik typically has 'Glide' (allowing him to float across gaps) and 'Launch' (a powerful jump). Mia often has 'Stealth' (to sneak past enemies) and 'Sprint' (for rapid movement). These Fortes are crucial for exploration and puzzle-solving.
- Melee Attack: A basic close-range attack for dealing damage in combat.
- Treasure Vision: The ability to see through the eyes of your monsters to pinpoint treasure locations.
Their effectiveness in combat largely depends on your monster companions, as they are the primary damage dealers and tanking units. Focus on using Erik and Mia's Fortes for traversal and their Slingshot for support in battles.
While Dragon Quest XI S: Echoes of an Elusive Age features Erik as a traditional thief, this prequel reimagines his utility through monster-driven Fortes and slingshot mechanics.