- Seamus Finnegan: "What do you mean who is that? That's Daphne Greengrass, Ice Queen of Slytherin...? Blimey mate you've had classes with her for five years."
- Dean Thomas: "Never noticed her before if I'm honest. She's got quite a pair doesn't she..."
- Seamus Finnegan: "Don't let her hear you say that or she'll freeze your bloody bollocks; she's the Ice Queen for a reason. Plus, she's a complete bitch; wouldn't associate with her if the headmaster himself ordered me to."
- — Seamus Finnegan and Dean Thomas discussing Daphne
During her time in school, Daphne earned the nickname the Ice Queen of Slytherin because of her cold demeanour towards others and affinity for ice spells, which she once used to freeze Gregory Goyle's privates after she got tired of his unwanted advances. In their fifth year, Daphne successfully convinced Harry Potter to allow the entry of a few Slytherins whom did not wish to follow to the Dark Lord, changing the other D.A. members' perception of Slytherins. Daphne participated in the Battle of Hogwarts and fought alongside her sister, Astoria. Unfortunately, the Battle ended up costing the lives of both her parents, devastating both her and her sister.
After the final battle, Daphne married into the Prince family. She birthed two children; Jacob Lorcan and Amalthea Astoria Prince. She attended the reunion of Dumbledore's Army at the 2014 Quidditch World Cup and