Pro heroes:Present mic,Allmight,Endeavour,Eraserhead (Aizawa),Midnight AU:Chain’s are the creation of the Intention of the abyss’s quirk and people can form contracts to use the chain’s powers.If a chain isn’t contracted it will need to eat humans but their are few exceptions such as the Cheshire Cat who was made to protect the intention of the abyss.Due to the chains origins they are looked down upon by the hero commission as fake quirks