Immortality - As a demon, Brady could live forever unless killed.
Invulnerability - Even for a demon Brady was durable, Crowley stated even he couldn't crack him through torture. It took several blows from a crowbar after he had a bag with a Devil's Trap on it put on his head to knock him out.
Possession - As a demon, "Brady" possesses Tyson Brady.
Telekinesis - Brady could move objects and people with his mind. He opened and closed his office door as well as moved a chair all with a simple wave of his hand.
Teleportation - Brady was able to teleport himself downstairs while chasing Dean.
Spell Casting - Able to perform the spell to use a goblet of blood to contact other demons.
The kind of rich kid stoner that struggles to succeed in college, Tyson Brady would likely have failed out of college by his sophomore year. Instead, just before freshman orientation, he’s possessed by a demon. The demon inhabiting Tyson (henceforth known as Brady, a nickname the demon chose for himself) intends to secure a powerful position for himself once Lucifer is freed. Although he is deeply loyal to Azazel in word and deed, it does not come from true faith in him or his cause. “Brady” is ambitious, striving to improve his station in life. If a better offer comes along (especially once Lucifer has been freed), he’ll take it in an instant.
In service of Azazel’s ends, Brady befriends Sam Winchester. The two develop a strong platonic bond during their first year at school. Brady’s goal is to give Sam a support system and rip it away. He continues to cultivate that friendship and tries to help Sam adjust to life at Stanford. He can build the man back up, bit by bit, until the tower comes tumbling down. Brady knows what the plan is, but he knows that it ends with him having more power than he knows what to do with. He can cope.
By the beginning of sophomore year, Brady has established a reputation as an intelligent, competent young man- something he’s proud of, despite knowing that it doesn’t matter in the grand scheme of things. He’s not here to impress the humans, he’s here to free Lucifer. Still. It feels nice, elevating his vessel’s reputation, when all Tyson wanted to was drink, smoke, and get laid. Eventually, he even goes home to visit Tyson’s family; they’ve been bothering him for over a year about visiting, citing their incredible amounts of worry about how he’s doing at Stanford. He goes for Thanksgiving break, willing to indulge them. It won’t cost him, he thinks.
The argument is legendary. Brady has never seen humans argue before, and so he spends most of the time playing catch-up; he draws on his vessel’s own reactions, muted though they are by the way his long-term possession has worn him down until there is little of the original man left. Tyson would be furious with his parents, and furious with Brady for bringing him home; they had expected him to become a pastor, like his father. They argue with “Ty” about his de-conversion, their estrangement, and the photos they found online of him during his post-graduation trip. Brady finds the entire experience entertaining, and thinks nothing of it when “his” parents declare that they’re going for a drive to clear their heads. After the endless conversations with police, extended family, and more, he finds his patience has worn thin.
Returning for the spring semester of sophomore year, Brady sees an opportunity: Sam expects to see a man grieving his parents. He can give that to him. He behaves erratically, engaging in the kind of reckless activities that Tyson would have wasted his college years on anyway. Tyson, still conscious and more detached from his life than ever, happily obliges. Brady relishes in having a host who has finally submitted, and finds himself considering, for once, what he wants, outside of what Azazel demands of him. Sam, worried for his friend, begins to hover over him. Brady knows that the long-term goal is to give Sam everything he wants and then painfully wrench it from him. He also knows that he likes having someone’s attention like this- someone caring about him. It feels better than anything he’s ever felt before besides the moment he sees in someone’s eyes that they’ve given up resisting him. He pretends to confide in Sam, sharing some of his vessel’s genuine grief as though it were his own. He kisses Sam.
It’s not long after that. Although Sam initially pushes him away and Brady pretends to feel bashful, when he eventually fakes recovery and asks Sam out on a date at the end of their sophomore year, Sam agrees. Things start coming together. Near the beginning of their junior year, Brady engineering a ‘chance’ meeting between Sam and a girl that he suspect he would like: Jessica Moore. Although Sam resisted his feelings at first, Brady suggested the possibility of a polyamorous triad. Sam struggled with the notion at first, but luckily, Jess proved the type to accept. Brady is quite proud of his handiwork. Although it stings a bit when Sam and Jess enjoy each other’s company without him (he wonders if humans are even capable of the kind of envy demons are), he’s accomplished the most important thing: building something that will destroy Sam when it comes to a tragic end. He might be starting to get a little bit attached, though…