Acornpaw - thick-furred, light brown tom with green eyes.
As Riverpaw's slightly older brother, he and his littermate, Dustypaw are very careful about what happens to Riverpaw. He has a sharp tongue and is short-tempered, but is "nice" sometimes. Neither he or Dustypaw does not know about his sister's power.
He is first mentioned in Thrushflight's Past.
He appears in Rising Shadows
"We can't find her anywhere and Lakestorm will shred us if we lose her" - Acornpaw to Thrushpaw