Aryll is Link's sister. She and Link both grew up on Outset Island under the care of their Grandma. Aryll developed a fondness for seagulls, that often flock to the lookout tower of Outset Island, which she named "Aryll's Lookout". The closest thing to a fellow human friend seems to be Sue-Belle, the girl who is constantly seen carrying a jar.
Zelda Papercraft: Aryll