I've put the Gunner first because he is the main statue and is always mentioned and doing something helpful, in the first book he saves George (a human who got stuck in London with moving statues) from a pterodactyl and some salamanders by shooting them and turning them to dust.
In the second book he is stuck in the walker's (a human who's cursed to walk the earth for ever)
home after saving George again.
You can find him in Hyde Park Corner.
