Does the Kleinstock brother power when the game starts or each turn?

Merged Form: When Kleinstock Brother starts the game, choose his starting line. Invulnerability and damage +1, but only if Kleinstock Brother is within 3 squares of exactly 1 friendly character named Kleinstock Brother, both with different starting lines. Impervious and damage +2, but only if Kleinstock Brother is within 3 squares of exactly 2 friendly characters named Kleinstock Brother, all with different starting lines

I think it is continuous but I wanted to make sure

The only part about that trait that refers to the start of the game is about choosing which startling line Kleinstock Brother will use.

The rest is constantly checked.

That's what I thought. Thanks