His life’s mission has been to find his polar opposite, which he believes he has unearthed in David.
Unbreakable has now established a traditional hero (Willis) and a worthy villain (Jackson), meaning a sequel could continue to pit these forces against one another.
Elijah, we learn, has a condition that makes his body vulnerable.
The big twist that Shyamalan drops is that Elijah has been the cause of multiple tragedies, mainly because he has been looking for powerful people like David… and like himself.