Bertholdt might be a good fit for Jason. While Jason is not a Shifter, he WAS raised by a Pokemon Shifter Mightyena and is pretty close to her as well. He's also a newbie Ranger and could very easily be convinced to help people get into their ranks with applications or training or whatever. He's helpful like that.

Also, while quiet, he's a very friendly guy so I think the CR would be super positive.