Kingston, Mushkin, Corsair, and Axiom are the agile Mountain Goats in the magical world of Blades of Brim. 

They can be obtained from the Chest. You can summon them during the Run by double tap, and they will accompany you for a specified time. 

This rascal works like a Coin Magnet and lures Coins you pass, it will also allow you to perform Double Jumps and will protect you from Enemies. He will bravely take the damage for you and disappear.