Dr. Claw

Jonah is very protective of his loved ones.  Every once in a while when Lucas is getting a reprimand (usually a very deserved reprimand :), Jonah will lower his chin, give you the stink eye and yell in what I call his best imitation of Inspector Gadget's Dr. Claw, "Don't you say that to MY BROTHER!"

Or if Aaron is getting into one his animated and passionate, yet benign, discussions about politics, justice, current events or really just about anything, Jonah will again glower at him and growl, "Daddy!  Don't you say that to MY MOMMY!"  

Last Wednesday morning, Lucas was struggling to keep up his morning routine and so words got a little heated.  Jonah comes up to me in just his Cars underpants, pulls on my leg to get in my face and menacingly whispers, "Stop acting like a nerd to MY BROTHER!"

Loyal: yes

Intimidating: no

I might tip him off that if he wants people to take him seriously a good start would be to wear pants.