Heraldic officials lower-ranking than a
Herald. There are currently three English and six Scottish pursuivants.
In the College of Arms, the governing body of heraldry in England, there are Rouge Croix Pursuivant and Rouge Dragon Pursuivant. There is also someone called Fitzalan Pursuivant Extraordinary... as if the first two weren't quite extraordinary enough.
Other possible English pursuivants, offices not currently in use, are Bluemantle and Portcullis.
Scottish heraldry is governed by Lord Lyon King of Arms, and under his direction are Kintyre, Unicorn, and Carrick Pursuivant. There are also three earldoms that have their own private pursuivant (don't ask me what they do with them): Slains Pursuivant attends the Earl of Erroll, Garioch attends the Countess of Mar (the oldest of all Scottish titles), and Endure attends the Earl of Crawford.
The Scottish office of Linlithgow Pursuivant Extraordinary is not currently in use.