I was a dangerous criminal and one Christmas night I found myself being chased by a large, horned beast with matted hair. I managed to bargain my way out of a beating and now I bring Krampus's wrath to the naughty all year long

(Any race, Fiend Warlock)

I was just a normal person until my adopted Father entrusted me with an evil ring of immense power. I was told to go on a long and arduous quest in order to destroy the ring but I realized that the ring was too precious to lose. Now I serve the all-seeing eye and have brought destruction all across the world.

(Halfling, Fiend Warlock)

"I am a great and mighty Knight who has just recently left the kingdom of Cormyr in order to explore and test my metal against the challenges that this new world contains. I will become famed and feared for my bravery and power. All those who have doubted me are wrong and I will quickly prove why that it is so."

(Any martial class, Knight background. Purple Dragon Knight Fighter would make sense.)

"I was born to high society with a plan already set before me but the road called to me. I followed my heart and struggled with the consequences that followed me. I am stronger now and surrounded by people I love and trust as we take on the world together." 

"I was born in the woods and grew up with the wolves. Settlers have encroached on my family's land. I will use my druidic powers to defend nature, even if I am broken, battered, and wounded in the process."

(Any species, Druid.)

I was a genius, a prodigy studying in one of the most prestigious schools of magic on the continent. I was practicing my divination magic when I sensed something was off and I decided to investigate the matter, and I realized that this school wasn't what it seemed, in fact, it was hiding many dark secrets in the dark labyrinths below the school, but I got caught spying, ended up being used for one of their experiments, and they performed a ritual on my to curse me with lycanthropy, one that couldn't be so easily removed. I managed to escape, but now I'm wanted by the school and am being hunted, and I still look for the caster in hopes that killing him will free me from the curse.

(One of my characters.)

I used to deliver hand made wooden toys to the children in town who’s parents ordered them each year for the winter solstice, but I just couldn’t keep it up after my work crew of fellow elves went on strike. After that I had to go into a new line of work, and the only other thing I’m good at is swingin’ an axe. So now I chop down monsters instead of trees, and make bank instead of toys.

(Elf, Failed Merchant, Barbarian)

"I am a Goliath from mountains far away, but I have not left my home for the reason many of my kind do. I do not seek adventure or glory and was castigated for it, so I fled my home head bowed in shame. I hoped to read and study and learn more magic and knowledge in the worlds far away, but it seems that all I have done is gotten myself caught up in quests for knowledge..."

(Goliath Wizard.)

Lump of Flesh was shunned from his society because of his hideous appearance. He fled to the underdark, found a hive of naked mole rats who saw him as a giant version of themselves, and became their leader. He now travels the world with a swarm of naked mole rats, causing anyone who looks upon them to be overcome with revulsion.

(Hairless Tabaxi, Swarmkeeper Ranger)

I used to think I would live and die within the same 5 square miles, that was, until the day the ravens came to my village. That night I was visited in my dreams by a beautiful woman in a black dress and a porcelain mask who told me my destiny was to serve her in this world. Now I am to travel the world in her name, all I need is a fellowship whose goals align with my lady’s to travel with.

I am a cast out wood elf who lived on the streets of water deep for many years

"I am a deposed king who seeks to rebel against the new regime from the shadows. I have always been more of a schemer than a warrior. However, I have so few allies in this conflict and it seems that I will have to learn how to fight on the front lines."

(Noble with at least 1 level in a martial class.)

My father died when I was little, and my mother and I lived on the coast in a small, dirty hut. When she died of a mysterious disease, I fled the small town we lived in and met a rouge ranger, who taught me her craft. I am now on a quest to avenge my parents and uncover the mystery behind their deaths.

"I was a good girl all year, all I ever asked for was a pair of cha-cha heels.  I told my parents they'd be sorry if I didn't get it, and when they got me penny loafers instead I got so angry I could have set the whole neighborhood on fire!  Anyway, they're dead now, good riddance, and now that I'm an adventurer I can finally get my new pair of cha-cha heels!"

-Human Barbarian Brawn Bravenport

 Born out of darkness and spite a fiendish daughter of a devil and a vampire came to being without ever knowing her father and mother. She walked down the path of a champion of shield and sword, incorporating the use of her fangs and bloodlust gifted to her by her father, becoming a deadly adversary with the wings granted by her mother. She is seeking out her spawn searching for answers and guidance on how to hone her craft but is entangled in a group in the meantime, using them as a path towards her goal, biding her time until she can reach what she is searching for. 

- Winged Tiefling Dhampir Fighter (Champion)

I am a powerful magician who discovered that underneath our feet are the skeletal remains of ancient beasts. I traveled the world digging up these fossils and researching but doing so caused my desire to see one of the magnificient creatures with my own eyes. I use my magic now to reanimate these ancient titans to better observe how they would have acted in life, though having giant skeletal monsters follow me around comes with a few other perks. 

(Sage background, Necromancer wizard, any race though I would play a stone genasi, lizardfolk, or kobold. The triceratops headed ardling would also work.) 

The three sentence backstory of Narnra Shalace:

Elminster is the worst parent one could ask for, a deadbeat who left me fatherless in the streets of Waterdeep. Now known as a common (ok maybe not so common) thief, I finally ran into this man not as his family but rather his unwilling captive. Only after an interrogation did I realize who he was to me and now that I know the truth of it, I aim to end him.

Based on Chapter 4 "Truths as Sharp as Razors" of Elminster's Daughter, by Ed Greenwood. 

After the war, I no longer had a place in the army. Now I use my specialized design and the skills I picked up in the service to make my way in this world. Maybe one day I will figure out this freedom thing.

(Warforged, Soldier, any class)

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(Any race, Great Old One Warlock)

I was left for dead by the cops i worked for because i didn't follow them. After trying to sing my sorrows away, the god of music returned my life to me. After 19 years i worship him and fight for him because of his service.

Crap i just realized i made bard moon knight