You gain a score increase of 2 to your Charisma and another ability by 1

you can read, write and speak Common and Abyssal

being children of darkness, Bloodborn require less sleep.

The ancient powers that flow through your blood grant you increased resistances to dark magics

You can drain blood and life energy from a willing creature, or one that is grappled by you, incapacitated, or restrained. Make a melee attack against the target. If you hit, you deal 1 piercing damage and (1d6+ half your level) necrotic damage. The target’s hit point maximum is reduced by an amount equal to the necrotic damage taken, and you regain hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0. 

If you do not drink the blood of a living creature for 48 hours, make a DC 10 Wisdom saving throw, on a fail you must attempt to drink the nearest creature. The DC increases by 2 for every day after 2 until you drink again where it resets.

because of the demonic power that flows through your blood, you gain an innate connection with darkness giving you the ability to see better in dark conditions  .You can see in dim light within 60 feet of you as if it were bright light, and in Darkness as if it were dim light. You can’t discern colour in Darkness, only Shades of Gray.

Your connection to demons grant you the ability to lie easily and weave the truth to your liking