I don't know how many of you see my comic but I got some background for the people who are all confused.
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So Jamie and Diane are known as the "Lucitor Twins" the "Lucitors" or "The Underworld Twins" since their father is King of the Underworld. Since Tom himself was already 50% mortal and married another mortal, his kids are around 75% mortal, which explains them being human size rather than huge like their grandmother (Wrathmelior).
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So Diane was always known as the "superior twin" even though the siblings get along really well. Diane's nickname is Ane, (pronounced Anne) and will sometimes rarely also go by Di and Annie. She was very spoiled by her father, she somehow always knew she was Tom's favorite since she held more demon traits than her brother. Though she doesn't hold much looks from her mother Janna she still holds her love in macabre things.
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Jamie is another story. His full name is Jamison and shortens it to Jamie. He hates the nickname James since it only reminds him he's royalty. He's not the superior twin but he isn't below Diane either, he's just there. He's closer with his mother since she understands him more and they look nearly alike. His father puts a lot of pressure on him since he aims for Jamie to be the next ruler of the Underworld, but Jamie refuses. He knew Tom wanted a strong son to rule the Kingdom but instead all he got was a fleshy human-looking boy.
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I could add more but my fingers hurt from typinv a lot, I'll add stuff later maybe