I was caught In the middle of the pack, looked around and I knew there was no turning back, my mind raced and I thought what could I do and I knew there was no help, no help from you… Sound of the drums, beatin' in my heart, the thunder comes, and tore me apart. I've been… thunderstruck. I awoke and said yeah, it's alright, I’m doing fine, yeah, it's alright, it’s my time to shine. So fine, so fine. I've been thunderstruck, yeah, yeah I am Thunderstruck. (low level fighter struck by lightning that awakens latent power of storms and lightning. Now a storm sorcerer or draconic bloodline sorcerer - blue or bronze or genie warlock - thunder (djinni) or tempest cleric).

Blantant copy of AC/DC all time hit. But had to share what could be done when your mind just says.... go with it and let the feeling grow and the imagination flow.

I’m Chloe Burnbutt, a satyr foundling raised by a loving orc family—my brothers gave me the name after I backed into the fire one too many times, singing my tail. As a child, I vanished into the Feywild, where I forged a pact with an Archfey who eventually guided me back home. Now, I use my magic to protect those I encounter as part of Farlmers Insurance.

I was raised by my famous parents to be ever-prepared—a true Scion destined for greatness—but I cast aside their expectations to chase the freedom of the circus, where I soared as the legendary "Skydancer." Amid the thrill of aerial acrobatics, I found my true voice in song, weaving tales not just of my own daring feats but also my very famous (you'd probably recognize their names if I told you) parents and their famed adventuring bands. Now, as a bard, I travel far and wide, ensuring that while I may have left their path behind, their names—and mine—will never be forgotten.

I took a little side trip one day and ended up in Giant territory—where a Giant youngling "adopted" me and very sweetly threatened to pull my wings off if I tried to escape. Now, trained in the Barbarian Path of the Giant, I wield my glitter-infused greataxe with pride, leaving my mark (literally) wherever I strike. And just to keep life interesting, I recently adopted three orphans—a pair of pre-teen humans and one very moody Orc teenager—because smashing things is easy, but parenting? That’s the real challenge.
 (Fairy Barbarian)

Quote from Ashareem >>

I took a little side trip one day and ended up in Giant territory—where a Giant youngling "adopted" me and very sweetly threatened to pull my wings off if I tried to escape. Now, trained in the Barbarian Path of the Giant, I wield my glitter-infused greataxe with pride, leaving my mark (literally) wherever I strike. And just to keep life interesting, I recently adopted three orphans—a pair of pre-teen humans and one very moody Orc teenager—because smashing things is easy, but parenting? That’s the real challenge.
 (Fairy Barbarian)

I homebrewed this ages ago if you want some ideas for that axe

I never saw the moon on its own in the dark, there were always other things to see and do. But one night I was on the edge of the water on a beautiful night with the moon glowing, and suddenly I looked down and saw my shadow. I thought that was so cool, why I had not seen it before. Then a voice in my head said ‘It took me so long to find you and now we gonna cause one big hullabaloo’… six months later… outside the small tavern & inn, ‘Come as You Are’, set just off the Half Moon Canal at the beginning of Laughing Ravens Forest, I’m speaking to a few adventurers, ‘Now I listen and learn from my moonshadow, moonshadow, leaping and hoppin’ with my moonshadow, moonshadow. Oh my name, I’ve been called Lune, Waxer, Waner, Year-Counter, Clipped, Shiner, Gloam, Hastener, Squinter, and Gleamer but I prefer Mani. Can I and my moonshadow tag along? I would be so grateful if you would allow me and my moonshadow to join your adventure. Yes, you said yes. Great, we are off on an adventure’. The rest of the group look at each other with puzzled looks, as Mani leaps & hops around them. Why did they say yes? –

This can go so many ways… play it straight with a quirky flavor or go wild as in wild magic. Use any class any race… it does not need to be a bard… or a fey… and have fun building your character’s story (with help from dm) as you go.

Bang a gong, my mind is gone. Take me. For now IT does the thinking.

So many possiblilites... let the teeth of the hydra be on you.

My OC Axe Ironcleaver's backstory. I've played them as a Warforged, though they aren't from Eberron.

I was built as the first of a new class of Battle Strider war construct, with no equal on the battlefield. Everything I was built to protect was destroyed only minutes after I was first activated, and no others of my kind were produced. I was reactivated centuries later by a group of rebels and outcasts that I have come to see as my family.

Down a dark, dark street is a dark, dark house and in the dark, dark house was a dark, dark room and in the dark, dark room was a dark, dark closet where my dead body was stashed. Who or what killed me is unknown to me as is their reason for doing so, as is my knowledge of how or why I now live again. I feel a new awakening and I am more at home in the shadows than I was in the past, I feel no need for revenge nor any other emotion just a constant sense of calm as I now venture forth.

*Reborn + Way of Shadow Monk, flavour all monk abilities as more shadow/wraith based than martial art forms.

1. A child prodigy painter grew up in a strict elven family that expected perfection in every aspect to the point he felt suffocated. 
During a terrible fever, he had maddening visions of a figure he could not describe even after painting the being on his walls dubbing it, "Beloved".
Driven mad by his parents' expectations, he rebels in every manner before setting out into the world to see the wonders and search for his "Beloved."

2. A Tiefling bard and his party go up into the mountains for a quest. 
Only the Tiefling comes down months later. 
He still talks to his party members that no one else sees as he wanders aimlessly. 

I was raised by my Aasimar mother, in the northern tundra in a village that is deeply tied religiously to the god of death, winter, and fate known as the Raven King. In my past when I was about 9, I saw him, and I was connected to him by a golden thread. From that day forward I would keep seeing him once every year during the Winter Soulstice, so I chose to become a paladin of him to understand why I keep see him and to understand how I'm connected to him. 

I was possessed by a mimic at a young age; signs of it started out as an “imaginary friend” kinda thing, but it turned more obvious as a young adult when we started having conversations in front of others. Previously working as a diplomat for my small but powerful country, I am now an advisor to a king after his country and my home country formed an alliance. He is aware that I'm half-possessed by a mimic (he doesn’t know its name) but I have proven to be trustworthy and reliable enough to make the mimic's existence of no concern.

Cleric told me that I had a little bit of fever in my head and he said it'd go away. When he said it'd go away, I listened to him but I knew that it would stay because the fever that I had was in my mind - in my mind. Now I know the fever has a name… Silence of the Flame, I now listen to what it says, for the power it gives in so many ways… the fever in my mind is but a tool, and now the fever is cool.   (Acolyte or haunted background, any race, sorcerer, warlock or sorlock but I think fiend warlock multiclassed with aberrant sorcerer is best.) 

From first memory I was called Nosonofmine and sent to the fortress to collect manure and to tend bed pans and puke pots. Those years passed quickly and before I saw my first armpit hair I was trained to march, to guard, to fortify and to destroy and I took to this like seed to wind. Now with brothers of shield and sword I long for the battle that lies ahead.

Went for a walk met a wise man who told me "Find a lady, meet her mom, meet her dad, get married, drive away, raise a strong family, until the wheel spins and the law says you're a hanged man by the action of your hand. This is the last: you had the world."  I'm to ever remain a chaste bachelor wizard  and ever in peril of falling prey to this cursed fate, don't tempt me.