Arthur Ludorum
Arthur is a friend of Teppic, and successful scholorship student assassin mentioned in Pyramids. Although he starts out a little wet (saying his bedtime prayers [ie, sacrificing a goat]) and is teased by the other student assassins, he turns out to be the son of a famous now-dead assassin, Johan Ludorum, and has a great capacity for controlled violence, despite his small stature, baby-faced appearance and blond curls. Teppic notes that he is allowed to use really interesting poisons and will probably stay for postgraduate work.
He and his mother appear to be the only remaining member of the Strict Authorised Ormist church.