who are the chasers or chaser

[Firewolf]

is the old man a chaser bc he seems to controll the keyblades at will while the knights just got there ass kicked and i think its a prequil bc mickey didnt have his golden keyblade

[Hitoshura]

Well....We dont know...A lot of people have been looking at the dictionary and the definition of chaser is: "someone that crafts metal." So my best guess is that they are possibly the people that made the keyblade or the keychain.