Blessed Soul of Arvandor

As a Blessed Soul of Arvandor you have been granted access to magic from Arvandor - a realm where ancient elvenkind resided before even becoming elves as we know them and before they even decided to venture out into the Feywild, and later on into the Material plane. The ancient pure magic of this realm at its source is of great power and it is woven into the residents and into the air itself. Even today, elves have a connection to Arvandor. Some scholars believe that all those traits elves have that give them long life, natural beauty, and nimbleness (and other elf traits) are a result of the connection to Arvandor. 

However, Arvandor magic is a chaotic one and seems to sometimes have a life of its own. Sometimes not only elves might be touched by its magic. Somewhere, somehow anyone can be touched by it and become a sorcerer or it might happen that this person simply carries a gene that will be activated in one or in who knows how many generations. This magic works in mysterious ways and it might be saving itself for someone special or waiting for a time when it deems necessary to be activated (maybe in face of some horrible apocalypse?). Work with your DM to see how your BSA Sorcerer got to have this pool of chaos. 

Being touched by this magic can physically alter the wielder. Dwarves might not be able to grow their beards. Humans might be indistinguishable from elves, etc. It might also change their personality, making them more charismatic or maybe hard to notice or in some cases, they might become a trickster and chaotic.

There are many ways someone can become a BSA Sorcerer. Maybe they came in contact with some magic item from the Feywild, or maybe simply got from lineage. Make up your own fun story of how you came to be a Blessed Soul of Arvandor.

Blessings of Eladrinkind (Autumn Feystep)

As a bonus action, you can magically teleport up to 30 feet to an unoccupied space you can see. Once you use this trait, you can’t do so again until you finish a short or long rest.
Immediately after you use your Fey Step, up to two creatures of your choice that you can see within 10 feet of you must succeed on a Wisdom saving throw or be charmed by you for 1 minute, or until you or your companions deal any damage to it.

Faerie Magic

You may replace 1 sorcerer spell with a spell from the bard spell list. You may change any of your sorcerers spells with a bard spell every time you gain a level. There is no limit on how many bard spells you can have as long as you are choosing a spell you have spell slots for.
In addition, you choose your affinity (chaos, neutral, law). The affinity gives you one more spell, not counted against your maximum number of spells.

Pixies of Arvandor

At level 6, you gain another Blessing of Arvandor. As an action, spend 3 sorcery points and summon 1d4+1 Pixie. The pixies appear within 60 feet of you. They act on their own initiative and they do everything they can to help you.

SIZE: Tiny Fey
HP: 1 + your charisma mod
DURATION: 10 minutes or after dropping to 0 hit points.

For everything else use the Pixi Stat block from the Monster Manual. 

Elven Protection

At level 14 you gain another blessing of Arvandor called Elven Protection.
Once per combat, as a reaction, whenever you are hit with an attack (does not apply to AOE damage) you can call upon this blessing. As a result, the attack goes "through" you as you were a ghost. You instantly become invisible and you gain +1 AC for 1 minute. 

Wings of Corellon

Corellon, the God and maker of elvenkind grants you a blessing of flight. 
As a bonus action, spend 6 sorcery points to gain winged elf wings for 1 hour. 
Your flying speed is 60 feet.

Alternatively, you can choose to have a flying speed of 30 feet, and pick 3+your charisma modifier creatures that you can see to also have elf wings for 1 hour. 

After yu use this ability you can use it again until you have a short or long rest.