I’ve seen their interests beyond ‘Potter’ flourish. Emma got the highest grade in English A-level in the country. She’s blossomed into a true beauty and she’s fiercely intelligent. Rupert is a true eccentric. He has a Hovercraft and an ice cream van. Dan is one of these voracious inquirers of information and knowledge. He’s so enthusiastic. The experience from the theater has really fed into his work. Emma is involved in fashion. She’s modeling. Rupert is just a natural comedian.
— David Heyman (source)
It’s kinda of crazy how the actors personalities mirror their characters personalities.