Hi, Glenn,
The attached file shows a simplified way to present each character's content, using only 1 layer per character.
The trick? Using states for the Feedback, which is controlled by a text variable. And enabling the next character button is done with a simple trigger on the layer's Close button.
After the edited slide, I added a slide with some additional notes.
Since this isn't directly related to the topic of this post, I suggest you start a new discussion if you have additional questions about your interaction. That'll make it easier for others to find in the future when searching. Also, a new post will probably be answered more quickly. (FYI: The Forum doesn't tag people. Someone will only get a notification if they subscribe to a discussion. So even a post's author won't necessarily get notified when a comment is added.)