Willa Joanna Chance Holland is an American actress and model. She is known for her roles as Kaitlin Cooper in the Fox teen drama The O.C., Aqua in Kingdom Hearts, and Thea Queen in The CW series Arrow as well as its spin-off The Flash.

Aqua is a character from Square Enix's video game franchise Kingdom Hearts. First making cameo appearances in Kingdom Hearts II and its updated version Final Mix, she is introduced in the prequel Kingdom Hearts Birth by Sleep alongside her friends Terra and Ventus. The three are Keyblade apprentices training under Master Eraqus, and are the playable protagonists. As the only one among her friends to obtain the rank of Keyblade Master, Aqua is assigned to monitor Terra and Ventus as she combats dark creatures known as the Unversed.