While it’s fun to try to pin down what makes people the way they are, it’s very difficult to isolate personality traits in correlation to eye color. Far too many factors are at play in any study that you see concerning the connection.
For example, one study published in 2013 found that brown-eyed faces were perceived to be more trustworthy than blue-eyed ones. However, they concluded in the end that it wasn’t necessarily brown eyes themselves that indicate trustworthiness, but rather the facial features associated with brown eyes that create that subliminal messaging.
So, be mindful of the few psychiatric and behavioral studies you see that tout with absolute surety that their findings correlate entirely to eye color. After all, correlation does not equal causation, so more of one eye color group doesn’t necessarily mean eye color is the factor causing the thing.