Helpers are NPCs who travel with you and fulfill a specific purpose in and/or out of battle. This is expressed by several different functions. Helpers never fight directly and are generally un-targetable in battle.
Ebenezer
Lore: On request, Ebenezer can make a 2d6+5 lore (monsters) or lore (magic) check about a matter at hand.
Chemist: Ebenezer can carry up to 10 items on his person. At the end of a round, he may use an item on request. For the sake of items that require his PWR stat, it's 10. If it requires his force score, it is 4.
Fire Support: At the end of a round, Ebenzer can be called on to cast a powerful fire spell. This deals 2d6+60 points of fire damage to a single target but disables him for the rest of the day. His various functions cannot be used until he gets a night's rest.
Inventory: Hi-Potionx10
Jessica
Thievery: On request, Jessica can make a 2d6+5 thievery check.
Healing: At the end of a round, Jessica can be called on to chant a quick cure spell. This heals 2d6+10 points of damage to the entire party. She may do this once per combat.
Status Fixer: At the end of a round, Jessica can be called on to manage a partial esuna spell. This cures one status effect on one party member that esuna can cure. She may do this once per combat.