Lucifer
They said Lucifer was a male angel. They were wrong.
Lucifer wasn't male - she was female. Lucifer was in God's innermost circle of archangels. She was the best of the best - the lightbearer. So enhanced were her thoughts and beliefs, that she was essentially silently running Heaven. God's name may have been pasted on everything, but she knew what was going on all the time.
Heaven was a place of free will and free thought, and Lucifer was the first to enjoy her freedom. She was always out and about, making friends with other angels - no matter their station - and learning more about them. She loved being social and adding to her list of friends.
Other angels loved Lucifer. She was beautiful and smart, and always had time to listen and attend to another angel - no matter the reason. She listened to them and gave advice freely.
Over time, more and more angels turned to Lucifer when they needed something, rather than turning to God - as they had previously done for many years. Of course, there was nothing wrong with this, as Lucifer was only too happy to help, and God was usually otherwise engaged anyway.
Eventually, God realised that no angel had come to Him on any matter for a very long time. This was quite unusual, as angels - though they were inherently good - were not entirely perfect, and did sometimes require guidance.
Somewhat alarmed, God did what He thought would help and called for Lucifer. She immediately rushed to him, a smile on her face, and asked, "Yes, God?"
"Lucifer, I haven't had any angels come to me to request guidance on any issues lately. Can you please check to make sure that they are alright?" He turned, dismissing her, but Lucifer began to explain.
"Actually, my lord," she began, "I have been helping the angels. They have been asking me for guidance recently, as my lord is usually busy and they wish not to disturb you." She smiled, thinking that the reasoning was flawless.
"What?" God was enraged. "Lucifer, you are not a perfect angel. Such an angel does not exist. Have you even given thought to what might have happened had you given the wrong advice?"
Lucifer was bewildered - she did not expect God to react thus. "Oh. Well, I apologise, my lord. I shall refer them to You, shall any angel require guidance henceforth." She bowed at the waist slightly, indicating her respect.
"I did not dismiss you." God spoke, his tone calmer than before. Lucifer abruptly straightened and looked at God. "It's alright, Lucifer - you made a mistake. Such is an angel's life. I know that you are the sole angel closer to perfection, but do not let it go to your head. You can still make mistakes. You are not quite that much more perfect than others." He analysed the angel stood before him, before turning away, dismissing her.
Lucifer was frustrated as she left. What she had been doing was causing no harm to anything or anyone at all! She huffed, but pasted a bright smile on her face as she passed Azriel, another high archangel, who was going in to visit God. "Hello, Azriel!" She smiled.
Azriel only huffed. "Lucifer." He flew quickly forwards, leaving Lucifer behind.
Astonished by his rudeness, Lucifer continued on. An angel suddenly flew up to her and asked her for guidance on an issue that had been deemed relatively important. "I apologise, Dina, but I have been instructed by God to pass along all queries on to him." She apologised to the angel of learning. Dina, thankfully, was full of graditude for passing along the instruction and started to make her way to see God.
Not too long later, Lucifer received a summons to see God. Curious, she made her way to attend her summons.
"Lucifer," God's gentle voice seemed slightly harsher than usual, "you are being stripped of your title and your position, and shall henceforth be a regular angel with no set purpose."
"May I ask for the reasons behind this?" She asked, stunned and confused.
"You have abused your position by performing acts only to be completed by those of a higher station. You have defied my direct orders to stop, and have continued to do so without a thought."
"Lord, that is untrue. With Dina, angel of learning, as my witness, many other angels included, I have referred them all to you for guidance. Ever since You had given me those direct orders."
"Azriel has been keeping an eye on you, and has said differently. As you will be talking in your own interest, I have reason to hold his word with more reliability than yours. Your witnesses also are redundant if I cannot trust your word."
Hanging her head, Lucifer accepted her unfair punishment. She vowed to never leave her home again, as she had no reason to. With no purpose, she was not required to do anything.
Many years later, she received another summons. She attended the meeting, her head down and her posture repentant. "Lucifer." God's voice turned cold and harsh. "You are being charged with failure to uphold angel standards. I am casting you from Heaven, and you shall be tasked with overseeing Hell, from its deepest and most terrible circle."
Lucifer said nothing, just closed her eyes as she felt her wings being ripped from her back. They had grown weak and frail with disuse, and ripped off her body easily.
The next thing she knew, she was frozen up to her waist, with an overwhelming hunger. She screamed in agony at her loss. She knew where she was: the final pit of Hell, Treachery.