Due to your Fay ancestry you gain 60ft of darkvision. 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 color in darkness, only shades of gray.

Your Fay ancestry grants you abilities.  

you gain a +1 to a stat of your choice 

Although Half-Fay reach physical maturity at about the same age as humans, the Half-fay understanding of adulthood goes beyond physical growth to encompass worldly experience. An elf typically claims adulthood and an adult name around the age of 100 and can live to be 750 years old.

Half-Fay vary drastically in alignment depending on upbringing but generally tend to lean towards Chaotic or Lawful.

Half-Fay vary in size from 4 to 7 feet tall 

your walking speed is 30 feet 

You have proficiency in the Perception skill.

As a Half-Fay you gain an inherent understanding of how to play the pan pipes and the flute.
Additionally you can cast disguise self with this trait, using Charisma as your spellcasting ability for it. Once you cast the spell, you can’t cast it again with this trait until you finish a short or long rest. 

You have advantage on saving throws against being charmed, and magic has trouble putting you to sleep.

You can speak, read, and write Common and Sylvan. Sylvan is fluid, with subtle intonations and intricate grammar. Sylvan literature is rich and varied, and their songs and poems are famous among other races. Many bards learn their language so they can add Elvish ballads to their repertoires.