Henry? (idk I like it for some reason)

Clearly takes after his father in looks and much of his personality, with hints of his mother in there. Though not many people realize it, much of that mischief also comes from Elsa. Just, how she behaved before having to learn such strict self control. Only Jack, Anna, Agthar and Idunn recognize it.

Completely and utterly addicted to ice cream and cheese, and is still trying to convince the cooks in the palace to try to combine the two.

If he can't reach a destination by climbing, jumping, flipping or sliding, that destination is not worth reaching.

Shoes are evil. Long pants are evil and will always be rolled up. Capes and hoods are awesome.

Has the most "unique" laugh out of all the Arendelle children, mostly comprised of hoots, cackles and snorts. 

The only one of his siblings to have less than perfect teeth. His two front teeth are slightly crooked, though that has been said to add to his "mischievous look", so he doesn't really care.

Completely covered in freckles.

Jack's almost inhuman agility combined with Elsa's flawless grace has given him amazing movement. Whether it's running, walking, sliding, jumping, climbing, flipping or just a casual movement, it's almost mesmerizing to watch. Though he mostly uses it in his hyperactive freerunning, and doesn't pay attention to it in other areas of his life. It remains there nonetheless. There is not a clumsy bone in this boy's body.