Read my above post. In season 1, episode 5 he's talking to Illryo Mopatis about the Targaryens. Being a primarily show watcher, especially with his comments to Oberyn last year, I always got the impression that Varys thought little of the Lannisters, Starks, and Baratheons. He's from Essos and wants the Targaryens back. Again, I've only read cliffs notes of the books and this has been my impression from the show. It was Robert who wanted Dany dead. Varys wouldn't have made that call, though he was obliged to agree with it.
Not sure if you actually read what I posted. It wasn't his tendency to manipulate others or his hunger for power that I was questioning. He's being borderline reckless, even with his own skin, so far in S5. That ain't Littlefinger.
I read what you posted, but I think Littlefinger knows that the Boltons can't kill Sansa, and he has taken a calculated risk that they might abuse her. He plans to rally the northern houses against the Boltons and kill them, and needs a Stark to do it.
I thought his speech to Sansa was less "Darth Sansa" and more "You are the only living Stark. Start acting like it." I doubt Sansa has any intention of acting out of character, but she does need to stop crying. I imagine Littlefinger will be doing the revenge part, but he can't let Sansa know what his plan is for fear they'll beat it out of her.
Of course, the fact that Arya identified herself to the knights of the Vale last year was very puzzling since anyone of any consequence would have grabbed her at that moment.