Big Red is a gigantic entity found deep in the Sewers. It will instantly eat and swallow Madotsuki. Inside its stomach is a whole part of the Dreamworld, including the Windmill world and the Block World, linked to it.
Powers and Stats
Tier: At least 7-C, likely 5-A to 4-A
Name: Big Red
Origin: Yume Nikki
Classification: Dream Construct
Powers and Abilities: Superhuman Physical Characteristics, Large Size (Likely Type 5 to Type 6; larger than the Windmill World) Resistance to Time Stop and Mind Manipulation, Immortality (Type 8. Reliant on Madotsuki. It will always come back, as she re-creates it subconsciously)
Speed: Unknown, likely Massively Hypersonic+ to Massively FTL+ (Via sheer size alone)
Lifting Strength: Unknown, likely Class Y to Stellar
Striking Strength: At least Town Class+, likely Large Planet Class to Multi-Solar System Class
Durability: At least Town level+, possibly Mountain level to Multi-Solar System level
Range: Hundreds of kilometers to Interstellar (several light years)
Standard Equipment: None notable
Weaknesses: None notable
Note: The size of the Windmill world is unknown. However, worlds similar in appearance and function have shown to be of quite large sizes, such as the Snow World holding a night sky filled with stars, or the Puddle World containing a moon in its sky.