Reid is one character you will do better not to try to recruit until late game for Eiyuden Chronicle: Hundred Heroes. The mission of adding Reid to Nowa's team is like a whole other story within a story as you go on a very long Beigoma journey.
As part of your Beigoma journey to recruit Reid to the Alliance you will first recruit Dr. Corque. This will mean undergoing a series of Beigoma battles with even more to come to get Reid after you've got Corque. In order to succeed at this, you will need a large collection of Beigoma and want to get stronger ones for a better chance at winning. Our Beigoma Guide talks through all trainer locations as well as Beigoma locations and strengths.
After you've recruited Dr. Corque you will speak to him in the Beigoma hub. Then you will defeat a series of spinadiers in this order:
Once Crash has been defeated, Reid will join the Alliance.
Role: Battle
Range: Long
Damage Type: Throw
Defense Action: Defense - Assume a defensive stance to take half damage this turn.
Rune Slots: 4
Enhanced Skill: Rune of Speed - Increases speed by 5%.
Rune of Poison Resistance - Increases poison resistance by 30%.
Beigoma Combo (w/ Dr. Corque) - Deal all enemies moderate smash damage. Cost: 3 SP.