first appearance (noun)

1. In the first appearance of the main character in the anime, the audience got a glimpse of her unique powers and charismatic personality.

2. The first appearance of the grand staircase in the architecture of the house left a lasting impression on guests as they entered the foyer.

3. The first appearance of the artist's signature style in her paintings added a new dimension to the art world.

4. In the first appearance of the mythical creature in the fantasy novel, the protagonist discovered a whole new world of magic and adventure.