I recently rewatched this movie with my friends and I suddenly had the urge to type the characters, so here it goes;

Olive- ENTP
Marianne- a very annoying ESFJ
Todd- a bit hard... IxFx?
Olive's mother- strikes me as an ESFP
Olive's father- maybe ENFP?
Rhiannon- ESTP
Mrs. Griffith- ExFx
Mr. Griffith- INTx maybe?
Brendon- didn't se enough of him, but ISFP?

Feel free to comment your thoughts below!