This is the full list of the characters that appear in Book from BFDI.
| Image | Name | First Appearance / Last Appearance | Gender |
|---|---|---|---|
|
Book | Lollipop's DEAD?!? | Female |
 |
Gaty | ||
|
Lollipop | Lollipop's DEAD?!? (dead) Lollipop Returns (alive) | |
| Four | Lollipop's DEAD?!? | Male | |
|
Dora | Book's Pingas | Female |
|
Saw | ||
  |
Taco | ||
  |
Ice Cube | Book Saves Christmas (but not really) | |
  |
Teardrop | ||
| Bubble | |||
| Remote | |||
| Tennis Ball | Male | ||
| Pen | |||
| Grassy | |||
| Balloony | |||
| Spongy | |||
| Cloudy | Book Saves Christmas (but not really) (Mentioned) | ||
| TV | TV's Virus | ||
| Firey | Trans Rights | ||
| Coiny | Trans Rights (Shown on paper) | ||
| X | Taco "Kills Herself" | ||
| Gelatin | Book Chokes On M&Ms | ||
| Puffball | Female | ||
| Yellow Face | Male | ||
| Sun | Overheated Objects |