Backstory: The year was 20XX AD, the Earth was in the future and now it is endangered of a planet from another dimension named Remina. Professor Oguro named the celestial body after his daughter and the two stars were on the rise until  one day scientists discovered that Remina was a cosmic monster bent on destroying Earth.

Background:

-Name: Hellstar Remina

-Cosmic Horror of Junjio Ito's works

-A literal living planet

-One of the most powerful monsters Junji Ito made

-I just like Junji Ito's work

-I was in the mood for a Junji Ito

-Nobody power scales horror characters due to them having weak stats

-Nobody did Junji Ito yet

-Many times bigger than Earth

Powers:

-Planetary physique

-Madness inducement

-Flight

-Can eat planets and 

-Can control it's own surface

-Gravity Control

-Emits it's own light

-Acidic Atmosphere

Feats(Strength and Durability):

-Destroyed the Hydra Constellation

-Ate Mars

-Destroyed Saturn

-Destroyed Jupiter

-Spin the Earth fast enough to make people fly around

-Ate the Moon

-Stopped the Earth from spinning

-Ate Earth

Feats(Speed):

-It's been stated that it can move speeds much faster than light

-Went across the Hydra Constellation in a small time frame

Feats(Strength and Durability):

-Hellstar Remina's base stats and durability

https://youtu.be/1bVfzBD-40E

>According to Life Noggin, for every 2x normal Earth gravity the Earth gets 8x more mass

>Size Comparison

>Remina is 140 pixels bigger than Earth os it would be 140x bigger, so that means it has a diameter of 1108450 Miles or the radius of with a weight of 836,080,000,000,000,037,211,865,088 kg or 921,620,440,837,662,219,173,888 tons

>Since it's 140x bigger that means Remina has 17.5x normal gravity

>Gravitational Binding Energy(GBE) = 3/5GM^2/R

>3/5 x 171.6225 x 921,620,440,837,662,219,173,888^2 / 554225 = 157,813,280,000,000,002,623,090,269,714,019,433,234,563,072 joules or 2 foe

>That means Hellstar Remina is Large Star Level

-Destroying multiple planets

>Here are the list of planets that Remina destroyed in the manga:

>1. Jupiter = 1.2334467e+51 J

>2. Saturn = 5.5910128e+49 J

>3. Mars = 2.5193938e+43 J

>4. The Moon = 1.24e+29 J

>5. Earth = 2.487e+32 J

>All of them combined it's 1.2893569e+51 joules or 12,840,153,958.3 foe or 13 gigafoe which is Solar System Level

-Destroying the Hydra Constellation

>The force needed to destroy a star is 55 ninatons and there are 17 stars in the Hydra Constellation, which is 935 ninatons which is Dwarf Star Level

Final Verdict: Solar System level in attack power, Large Star Level in Durability 

Stats(Speed)

-Hydra Constellation speed feat

>The distance between stars in a constellation is 2000 lightyears and that means went across 34000 light years

>Meaning it was moving at speeds of 719556274808428700000 MPH or 1,073,003,700,000x the speed of light

Final Verdict: 1,073,003,700,000x the speed of light

Possible Opponents:

-Ego the Living Planet(MCU)

-Mogo

-Scarlet Witch(MCU)

-Superman(Smallville)

-Red Son Superman

-Saitama