Princess Willa

Willa Swan (later
Princess Willa Swan-Jones) is the main
protagonist of OUAT meets Lord of the
Rings. She is the adoptive daughter of Snow White's daughter, Emma Swan,
the biological daughter of 
and Robin Hood, and best friend/half-sister of Roland and Robyn. Willa is also
best friends with Prince Neal, her uncle, but rarely calls him that, and Pippin Took, the only hobbit (besides Frodo, Sam and Merry) to not ridicule her 
As a baby, Regina feared for Willa's safety and entrusted her to Emma Swan, and thus Willa took Emma's last name. 
Because she desplayed heroic actions during the War of the Ring, Willa became the princess and heir of her mother's kingdom by Gandalf and Elsa signed on as witness.