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These characters are all available after the Eltisweiss war event in the main story. They will join your town or party shortly after the event is over and will be a valuable resourse in building up the resistance town from the ground up inEiyuden Chronicle: Hundred Heroes.
Ymir is your watch chief who gives out assignments to the watch of Grum County. Ymir will join you after the Eltisweiss war and takes the role of the resistance watch chief after the Eltisweiss war. He can help you form your party as well as give story assignments as they come out.

Sumire is found in the Eltisweiss Inn. She is the one who helped sell items as well as store items and gear. She will join you after the Eltisweiss war and will take on the role of warehouse manager alongside Caine. She can still store items, sell items, and prep gear.
Cassandra is the Eltisweiss Innkeeper who helps you save your game, rest to regain health and MP, as well as form your party. She will join you after the Eltisweiss war and is a support role in your part formation. She will now give you the ability to form your party while at save points from now on, as long as she’s been put in the party. She also takes on the role of innkeeper for the resistance headquarters as well and will still be there even if she’s been put in the support slot in your party formation.

Gocteau is a business manager who will be introduced after the Eltisweiss war and will join shortly after the resistance headquarters is set up. At the start, he will just be part of the town to help with investing in it, as opposed to helping the imperial army.
Iris is an architect. She will be joining the resistance shortly after the Eltisweiss war. She takes on the role of the town architect. She will be responsible for helping you build the town as you progress through the game. Iris operates the Drafting Studio, where you can plan new facilities for the headquarters. As you develop the down through her studio, it will grow and unlock various upgrades for the town. Some upgrades will require a specific ally to be recruited to run the facility, or you may have to advance the story. Bring her the funds needed to upgrade the town.

Caine is introduced alongside Gocteau after the Eltisweiss war and takes on the role of warehouse manager for your town. You’ll be giving him your resources found around the world so that they are kept in a reliable spot other than your pockets. After he joins the town, you may use him to sell any resources that are no longer needed.
These characters are all given to you via the main story as a means to get your town started. After they do join, keep an eye out for any other characters residing in the resistance town or in the nearby dungeons.

Eiyuden Chronicle: Hundred Heroes
Eiyuden Chronicle Hundred Heroes: How to Recruit Yusuke, Iugo, Kuroto, and Gigina
The more allies you have, the better!
