Matthew is a drop-dead classic Man Five.
His gentleness, his shyness, his observational attention to Anne, and his abhorrence of socializing, are all Five traits. He is steady, quiet, and loyal. Five.
He’s also awkward, boring, and invisible. Five.
In one version of Anne of Green Gables Richard Farnsworth plays Matthew’s Five-ness perfectly. He is the exact lovable mix of qualities. However, the actor is built nothing like Men Fives, who are tall and sometimes gangly, lean, or rangy. Physically, a Man Five is quite similar to a Man Four. The personalities are diametrically opposed, of course, but on first glance they are hard to differentiate.
It just goes to show that an actor’s Enneagram number will not restrict their ability to convincingly play a character’s Enneagram number. I like that.