Drawings Featuring Chains - Stronger with Every Link

The use of chains in visual art can make quite an impression. Though they often represent a binding or loss of power and freedom, they can also be used as a weapon, giving the user a powerful defense against those who oppose them. You may also see them represent an unbreakable bond between characters. 

The bond between Gilgamesh and Enkidu (from Fate/Grand Order) is perfectly represented by the winding chains surrounding them, don't you think? 

Do any particular link to any of the chained characters below?