After a few more hints:
Favorite color: purple
Favorite food: cheese puffs
Favorite subject: chorus
Graduated: 1337, Fenouil University
Briony: This is definitely the right Thorn. He’s been in the defense forces for a decade, and got his own team a few years ago.
President Romarin: How’s the rest of his CV?
Briony: Impressive. Great aim, unwavering loyalty, well respected by his colleagues . . .
Oh, and he slew the Wyrm of Ruraidh. Pretty much singlehandedly.
Romarin: Seriously? Someone should give him a medal for that.
Briony: You did, Lady President. Last year.
Romarin: Oh, right! Good for me.