The Leonardo Complex

Also known as Leonardo's Curse.  A struggle some actors go through when they perpetually look like a child, even when they grow up.  Named after Leonardo DiCaprio but also applies to Edward Norton, Winona Ryder, etc.  

Origin:  Even when playing a cop or a parent, Leonardo DiCaprio always looks like a child playing dress-up.

Usage:  As great as he is in The Bourne Legacy, Edward Norton never feels like he could be the head of this secret spy organization.  He's got the Leonardo Complex and could never really boss Stacy Keach around.

First Used:  The Bourne Legacy