This is the guild master
The guild master is one of the main NPC in the game, you will meet him with in the guild of course. when you meet him you will need to sign a contract to carry on with your adventure, after after that you will have to kill many monsters, to raise your reputation with him, when the bar is fully red you may then carry on with your adventure, by talking to the builder to start your kingdom.
Geting Hunters!
You may also higher hunters from the guild master to help you out with geting your rep or just genrely attacking in the outer world, although they are very costly (1500 coins) make sure you buy lots to keep safe.