Well, since Sarah Connor is retired, John doesn't have any parentals, as his dad is dead. Or possibly not born yet. Ow, the cyclical.

So...
Serious-ish one: Someone to be a Kyle Reese with Biehn icons. or promise boose to principalconnor.
Rediculous-y one: John Rambo. Dr. Silberman. Someone from Cyberdyne as a headhunter (recruiter).