Their enneagram types;

Frodo - 9w1
Sam - 2w1
Merry - Cp 6w7
Pippin - 7w6
Gandalf - 6w5
Saruman - 3w4
Bilbo - phobic 6w5
Legolas - 1w9
Gimli - 8w7
Aragorn - 4w3
Arwen - 9w8
Eowyn - 7w6
Theoden - 2