Blue Ball (character)/Backstory

(This assumes that NL takes place in 209N, when it is highly unlikely such assumption is canon.)

In the year 200N, a scientist named Dr. Rubber built Red Ball. One day in 201N, Dr. Rubber found an error in Red Ball's system. Dr. Rubber tried to find a way to fix it, but Red Ball fled due to their fear his identity may be wiped out of memory.

Dr. Rubber spotted Red Ball's disappearance, and thus Blue Ball was built along with Yellow Ball.

Eight decades later...

An error in space-time formed. A portal generated by said error sucked Blue Ball in.

And now, they are in Lemonland. They were trying to get out, but since they soon found out they can't, they gave up.

They inhabit that place now.