He’s short, sly and manipulative. And he’s in charge of the money. One?
He likes secrets, holding them and sharing them. He likes knowing more than others. He likes messing with your mind. Sarcasm and deceit. Yet, I want to believe. I want to find something worthwhile in him. He’s an underdog, actually. We’re supposed to suspect him. He tells Ned not to trust him, yet he helps Ned in ways he could’ve ignored. It’s as if The Game is playing constantly in his head, pieces shifting, and he’ll attend to you and reality in his spare time. He may even watch the tokens move afterward, seeing the effect of his words.
When Ned asks his advice after Robert’s deadly injury he gives an excellent answer. He openly shares a treasonous idea. When it’s rejected, Littlefinger moves on. Open, then closed. He’s like a door. His honesty combined with practicality, and his dry wit, really say One. Also, his use of money, the purse, as a tool screams One. What about his ability to spin on a dime, to negotiate with Ned, and then stab him in the back? Much can be justified when a One believes they’re in the right. A One can be a flat-out villain and have no idea. They relentlessly pursue a worthy goal in their mind. How the rest of the world sees them is not only invisible, it’s unimportant.