Bun-Bun is a stuffed rabbit that belongs to Lincoln Loud. It has beige fur, large eyes with pupils, a hard nose, and is dressed in a purple polo shirt. The doll sits on his bed during the day, and Lincoln sleeps with it under his covers at night. Lincoln cares very much for Bun-Bun, and gets panicky when somebody touches, or plays with his stuffed rabbit.
Bun-Bun is modeled after Lincoln's original design from when he and his family were going to be rabbits.
Lincoln is really attached to Bun-Bun, and can't stand the idea of anything bad happening to him.
According to Lincoln's "Ask Lincoln" segment on Instagram, he can't remember a time where he didn't have Bun-Bun in his life.