For all of us who have suggested Hirgon, perhaps this will be his month:
[glow=red,2,300]HIRGON, BEARER OF THE RED ARROW[/glow] He could be sculpted on one knee, offering the Red Arrow to King Theoden.
"He was clad as a rider with a cloak of dark green over a coat of fine mail; on the front of his helm was wrought a small silver star. In his hand he bore a single arrow, black-feathered and barbed with steel, but the point was painted red."
"He sank on one knee and presented the arrow to Theoden. 'Hail Lord of the Rohirrim, friend of Gondor!' he said. 'Hirgon I am, errand-rider of Denethor, who brings you this token of war.'"
This is a very important scene in the books, as Hirgon's arrival with the Red Arrow convinced King Theoden that Gandalf was right, and if Gondor fell so too would Rohan. At that very meeting Theoden promised that he himself would ride to Gondor with at least six thousand men, and bid Hirgon tell Denethor that he would come to Gondor within a week.
Here is another character who is mentioned by name and plays an important role in the story who Chris hasn't sculpted yet.