Corner of blue

The corner of blue is a corner of space in Earth-Gravildus-Batorok that's completely blue. It first appeared in Chapter 11 Part 1.

Chapter 11 Part 1
It was revealed that the rainbow road was at war with the void and the corner of blue. Cape Kragils asked what corner, and the rainbow road explained that it was a completely blue corner of space. Cape found out that the corner took over EGB Gravildus and tried to protect it, but he was sucked up by it too.

Cape said that it was fine, as he drank a blue cup with blue coffee. Both the rainbow road and the void attacked the corner of blue, the former leaving colors and the latter leaving darkness.

Cape escaped from the corner and tried to help Henryton with getting off of the space dolphin island, but he was ignored and went back to the corner with a space dolphin for a mouth. He looked at his reflection in a blue mirror and remarked that the dolphin didn't look that bad. The reflection called him a 'dolphin noise', but Cape replied with 'no u', causing the reflection to gasp.