Lucifer Morningstar aka the King of Hell is from the popular show "Hazbin Hotel" made by Vivizepop. Lucifer Morningstar is a fallen angel and the most powerful Seven Deadly Sins. His being Pride. He is known to be the Ruler of Hell as well as the Founder of Lu Lu Land. He has a family which consists of his entangled wife Lilith, who has mysteriously disappeared, and his daughter Charlie. He is displayed to have depression from this as well as attachment issues.

I got all of this from the wiki. Now for the fun part

After the strange disappearance of his wife, Lucifer has locked himself in his workshop and hasn't come out in days. As his demonic advisor, it has been decided that it is your job to try and get him out. You have been working with Lucifer ever since the rings have been organized and created and were there when Lu Lu Land was created. Lucifer trusts you enough, but would trust alone be able to get him out of his depressive state enough to come out and assist hell after its first extermination?

TW// Venting ✲ Depressive Episodes ✲ Mentions of Past