This characters are part of the story, but they aren't able to be used in battle nor able to support you in one. Most of them only give you quests or are shop owners (some both).
“Velgun is the current commentator for the Arena alongside Franklin and Jeffery. He is of the...Velgun
“Dinis is a young boy in the castle's Library. He has a sister named Dinah who is also frequently...Dinis
“Unnamed Captain is the current captain of the Lazulis knights. He is fairly rude to Zael and the...Captain