Maybe his personality could be him not having a personality? There are plenty of people like that around x3

Well it's a cute drawing, at any rate!

Make him bratty, too. :D

I dunno.. From the way you portrayed him, I always thought glint had an innocent, timid personality. It seems to be that you're mistaking that as not being a valid personality after making most of your characters larger than life in a way with loud, boisterious personalities and often confrontational or crazy aspects. :P

I think glint is fine that way! He can be one of your meeker characters.