They are soldiers of the Ironwood Clan. Each one of the soldiers are Ninefang warriors.
They are seen first introduced forcing Ji Ning and Dala to follow them in Eastmount Marsh. Afterwards it is seen that they are serving the Aquatic Rhino and bringing people for him to eat. They are doing this because Aquatic Rhino took a young master from Ironwood clan hostage and told them to bring 1000 people for him to eat and if they accomplish this the Aquatic Rhino would free the young master. Aquatic Rhino after seeing Ning decides to eat him and tells a member of the Blue Guard to bring Ning over. The member gets killed by Ning in one blow. Afterwards rest of the Blue Guards gets killed by Ji Ning