The key elements include variety in voices. There should be a good mix of different voice types for different characters, such as deep voices for older characters and high - pitched voices for younger ones. Voice modulation is also necessary. This means the ability to change the tone, pitch, and volume as the situation in the visual novel demands. For instance, in a tense scene, the voices might be lower and more intense, while in a light - hearted moment, they can be more cheerful and upbeat.
One key element is voice actor selection. Talented voice actors can bring the characters to life with their unique voices and acting skills. Another is emotional expression. The voices need to convey a wide range of emotions like happiness, sadness, anger, etc. And proper intonation is also important. For example, a rising intonation might indicate a question or surprise in the dialogue of the visual novel.