[The only picture that is mine is the cover]
-This is just more info on Lucifer, Rin and characters that might be in the story:D and the order is oldest to youngest.
Name- Lucifer
Class- King of Light
Gender- Male
Age- 1000+
Hair color- Blond/Gold
Eye color- Green
Interesting- Supports satan but has a moral line
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Name- Mephisto, Samael
Class- King of Time
Gender- Male
Age- 1000+
Hair color- Purple Black
Eye color- Green
Interesting- Apart of true cross
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Name- Azazel
Class- King of Spirits
Gender- Male
Age- 1000+
Hair color- White
Eye color- Teal
Interesting- Apart of True Cross, Crystalized
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Name- Egyn
Class- King of Water
Gender- Female
Age- 1000+
Hair & Eye- Blue and Green
Interesting- only female demon king, often goes to Assiah to escape her childish brothers, rivalry with younger brother, Iblis.
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Name- Iblis
Class- King of Fire
Gender- Male
Age- 1000+
Hair color- red orange
Eye color- Gold
Interesting- has a strong sibling rivalry with his older sister, Egyn. he hates how much stronger she is. Also is jealous of Rin because he has Fathers blue flames and he doesn't.
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Name- Beelzebub, Beel
Class- King of Insects
Gender- Male
Age- 1000+
Hair color- orange
Eye color- red pink
Interesting- Doesn't enjoy battling as much as his siblings but will if threatened
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Name- Amaimon
Class- King of Earth
Gender- Male -uses he/they
Age- 1000+
Hair color- Green
Eye color- Teal
Interesting- Apart of true cross because he is easily manipulated by Mephisto
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Name- Astaroth
Class- King of Rot
Gender- Non-binary - uses he/they
Age- 1000+
Hair color- pale purple
Eye color- purple
Interesting- Most loyal son of Satan calls Rin "Young Prince".
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Name- Rin
Class- The Young Prince of Gehenna
Gender- Male
Age - 9 (looks 6)
Hair & Eye color- Blue
Interesting- he doesn't know of his powers
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( My AU Sorry if they don't look as your imagining)