Yeah... I'm not much of a writer haha (I just wanted to develop a battle system and an ability system, then I just slapped a story on top of it lol). I think I have good ideas for the story in general and character development, but I'm not that good as conveying those ideas in writing. Like if I explain it's kinda good, but when I write the story it's hard to transpose those ideas into conversations and sentences.
But for the characters, the demo takes place in the part of the story where's there's a lot going on, so the characters have a bit of a strong reaction:
- Azel is usually a pretty nice guy, a bit cocky but still lovable, and a bit childish, but not annoyingly. His childish side comes from the fact that he lost his childhood since at that time he was consumed by vengeance and training hard to kill his parents's murderer. The demo starts right after the party gets their first clue on the Black Knight's whereabouts (the one who killed his parents), and Azel's feelings of vengeance (which were put in the background since the party did other quests because there was no info surrounding the Black Knight, so he was kind forgotten). So his vengeance and impatience kicks in in this part of the story, damaging his relationship with his friends.
- Marianne: the compassionate, conflict-avoiding, mother of the party. She's usually always in a good mood. However, during this demo, she suspects the leader of the soldiers searching for the party is her brother (she comes from the enemy side of the Empire). So after hearing the soldiers speaking, she worrying she might have to fight her brother.
- Francis: You pretty much nailed it, he's the cool-thinking and rational guy of the party, always dealing with the other party members's craziness lol.
- Yukari: Pretty much the jester of the party, but her funny and lack of discipline personality is her way of caring about others. Like you saw, in serious situations, she knows how to turn her jokes to off and be serious and supportive, since Azel was being a jerk, Marianne was absent minded, and Francis was angry at both Azel and Marianne. So she just snapped because the party chemestry (which was amazing in the segment before the demo) was kinda destroyed in an instant. But otherwise she's the funny one. To be honest her lines were quite fun to write lol.
Hopes this puts you a bit in context.