Official Art of Wren (Source)
Wrens are a species of passerine birds
Wren is the protagonist of Passing By.
Wren has shoulder-length brown hair that is tied in pigtails and black eyes. She wears a green shirt with three lighter dots on the front. She also wears a long-sleeved black shirt under her green shirt.
Wren wears white shorts and walks around barefoot. She has a green hairclip in the right side of her hair.
Not much is known about Wren's personality. It's quite likely that Wren has a light-hearted personality, given the nature of her dreams.
Little is known about Wren's past. At the start of the game she boards a train to see where it'll take her.