I always wanted Deeks' father to come back from the dead, because I feel like his father was the one that scared him the most, and I think it would cause a lot of drama. Because if any one could be a terrific mustache twirling villain, who could do a lot of damage, it would be Deeks' Dad. Of course, with these writers, he would probably turn out to be a good guy and all would be forgiven. Bleh.
Also, it might be a good reason to bring back Deeks' old buddy from Plan B.
Ah, this show was so great in its earlier years....sigh.