Avatar: The Last Airbender / The Legend of Korra - So I guess this is going to be Lin's father.

Who the hell has balls IN their dick?

Well, duh. If Sokka had been the father, then Tenzin and Lin would have been first cousins… I’d doubt that Nickelodeon would sign off on an incestuous romance…

This Satoru fellow looks like Fire Nation stock to me: Lin being half-Fire Nation would explain a lot about her personality…