Striped Bird
I love reading books. Especially the books upstairs. You should really.
Read them!Striped Bird, Chapter 1
The striped bird[note 1] is a Lightner from Hometown in Deltarune. A self-proclaimed fan of books, they first appear in the library.
The striped bird is a light blue bird monster that has a large head, large yellow eyes and beak, a long neck, short wings, and stubby feet. A yellow stripe runs across their neck, wrists, and torso. They appear to angle their head downwards, as if leaning over.
The striped bird initially presents themselves as an eccentric lover of books, who speaks with few words and pauses while speaking. However, as the game progresses, their dialogue begins to degrade, becoming more frantic and halting.
In Chapter 1, the striped bird appears in the library's first floor, blocking the stairwell to the second floor. If Kris interacts with them, the striped bird states their love for reading books, and excitedly recommends the books on the second floor. Interacting again causes them to reiterate their love of reading books, without the mention of the second floor.
In Chapter 2, the first two bookshelves containing How To Care For A Human and Book 1 about SOULS on the library's second floor are available, though the striped bird blocks the west end of the bookshelves. Thus, Kris cannot inspect the four other bookshelves. When interacted with, the striped bird reiterates their love of reading books, particularly the books upstairs, despite already being on the second floor. Interacting again causes them to state their love of reading, especially books.

During the daytime in Chapter 4, they are still upstairs in the library, having moved slightly to the left, allowing Kris to check the third bookshelf containing a book about Monster Funerals. They begin to repeat their prior speech about their love of reading, but then interrupt themselves as if they were realizing something.[2][3]
If a Completion FILE was used where Kris was polite to Onion at the Lake, the striped bird can appear at the end of the lake path. After Susie notices Onion is absent, Kris can revisit the lake to find the striped bird, including when it rains. When spoken to, the striped bird emphasizes Kris should not wait.[4] They disappear from the spot after Kris leaves, though they can be found in the library before it rains.

A character greatly resembling the striped bird makes an appearance in Undertale, as one of the Gaster followers. They are entirely grayscale and relay the history of W.D. Gaster.
- ↑ "Striped bird" is a conjectural name.
- ↑ gml_Object_obj_npc_library_upstairs_Create_0 script, Chapter 4
- ↑
I love reading. Especially... wait.
— Striped Bird, Chapter 4
Wait. The books upstairs. The books upstairs. Wait. The books are... - ↑
... Wait. Wait, love.
— Striped Bird if spoken to again, Chapter 4 - ↑
Don't wait, don't wait.
— Striped Bird, at the lake path, Chapter 4
Especially, the don't.