To answer your question about Priscilla Roseberry, I would need more context because I'm not familiar with this person or character, and they could be from a story, book, or another source I don't have access to. If Priscilla Roseberry is a character from a story or book you're reading in school, think about what the story says about her. What do the other characters say? How does she act? What does she look like?
Usually, the most noticeable thing about a character can be:
The way they look: like having really bright red hair or always wearing a hat with a feather.
Their personality: maybe Priscilla is super kind to everyone, or perhaps she's known for being the best at solving mysteries.
Something they always do: like if Priscilla has a habit of tapping her pencil when she's thinking hard about something.
If you can give me more details about Priscilla Roseberry, I can help you come up with what might be most noticeable about her!