In later dialogue and some choices, it seems that the Player really did look up to their big brother a lot.
While there's not much given as to what kind of relationship the player character had with Jacob, learning what had happened to him and finding his current whereabouts serve as their primary motivation.
The Atoner: Possibly, if you select options indicating it they just want to do right by the school and return honour to the family.
Your possible forms are a bird (an eagle), a cat, or a dog.
Animorphism: It takes participating in a timed sidequest, but you have the potential to become an Animagus.
note The general form is decided in a conversation, while the specific animal is further defined depending on your stats, meaning there's nine potential Patronuses to draw from After a failure early on, they succeed in summoning a big cat, an equine, or a hare.
Animal Battle Aura: In a timed sidequest, they find out that a Dementor is loose on school grounds, so they seek tutoring from Tonks to learn to cast the Patronus Charm.
Ambiguously Bi: By the time of Year 5, you're allowed to confess that you're smitten with a classmate of either gender.
Affectionate Nickname: Jacob calls his sibling "Pip".
Skye Parkin, a fellow progidy herself, and Rath, their rival and one of the best Beaters at Hogwarts, calls them a natural Quidditch player as well.
When it comes to Quidditch, the Player picks it up with little to no knowledge of the sport beforehand and become one of their house's best playes.
Year 7 has Jacob mention that they had performed wandless magic as a child, and they pick it back up pretty quickly after barely some research and practice.
The Ace: Proves to be a very adept wizard or witch, excelling at spells and potions beyond their level.
A first year at the beginning of the game, they quickly develop a reputation and become involved in a mystery that directly ties into their family. The Player Character, whose name, gender, appearance, and personality are player-determined, as is their House note The implication, by loading screens and trailers, is that they're meant to be a pale female with long brown hair and green eyes, but later trailers featured them as Ambiguously Brown female with shorter dark brown hair.