A child wandered the ruined streets like a stray, hoping to find his family in a destroyed world with only some small glimmers of hope. The boy was 10 years of age by the looks of it. His long golden hair traveled behind his back like a field of magnificent wheat and his two blue eyes seemed to glimmer with an ever-present wariness to his surroundings. He wore simple rags anybody could salvage from the surroundings: a pair of worn-down leather boots, a remarkably clean blue sweater, a pair of ripped jeans, and a small tattered cloak.

However, the most notable item in his possession was a sword wrapped in a different manner of rags and tissue and although the young man tried to hide its splendor, it still shined with an unusual splendor like a blue star in the night sky. It seemingly pulsed with a human-like heartbeat like a second heart that was separated from him but was still connected to the young man's soul.

As the young man scoured the grocery store for any edible food in this world, he heard a strange rumbling in the corner of the partially collapsed shop. Sneaking as quietly as he could, the young man witnessed a strange creature. The creature was made of multiple corpses and oozed out a strange green liquid that smelled like rotten food with strange hints of sulfur.

The human quickly stepped away but unfortunately his plan to sneak away failed as he stepped on a small twig that decided to appear right behind him. The creature raised its ugly mug towards him and slowly rushed towards him. Sighing to himself, the human named Finn rushed as fast as his legs could carry him. As he ran, his speed seemed to increase to unbelievable levels for his age. The boy could feel it within his body as a primordial force pulsed through his flesh and organs. It beckoned him to recklessly attack it but the young man resisted the temptation and simply outran the mass of corpses.

"Dagnabbit, I have to be more careful next time or I will lose my head sooner or later. Hopefully, I will find someone, I seriously…hope somebody is still alive"

Although the young man said those words, he knew that it bordered on childish fantasies more than ever. He has walked through three cities already and the result was the same. Only the stupid Oozers greeted him on a daily basis. Clenching his fist, the young man stopped the tears from spilling down his sorry visage. He needed to be strong to become a hero like the ones from the legends his mother used to tell him about. His mother's visage caused a single tear to go past his defense.

Once again, the young man commenced his journey, searching for anybody to fill his empty void. Fortunately, his journey was not fated to be very long as upon arriving in the next city, he heard a distant explosion. The boy's expression revealed slight hesitation to face this mysterious threat despite his obvious desire to meet some form of kindred spirit in these endless wastes. Clutching his sword, the boy faced the unknown with determined steps as a slight warmth coursed through his lungs, encouraging him further to move forward.

As he stepped past the buildings, he saw in the distance some Oozers circling around a flaming motorcycle. Finn squinted his eyes as the cogs slowly turned inside his head, thinking how could a motorcycle just explode suddenly. As he walked through the empty streets of the city, he heard a distant crash. Putting two and two together, the boy rushed faster than the wind towards the sound. Finn sincerely hoped that he could find any survivors that he could trust in this apocalyptic nightmare.

Sooner than he expected, he neared the origin of the sound and he saw in the distance among the destroyed buildings a small shop that seemingly read "Soupery". Finn couldn't exactly tell from this distance but as he drew closer to the building, apprehension, and anxiety filtered through his systems like poison through his veins.

'What if they try to kill me? What if they are like them? I don't want to go through that horror ever again.'

As these circulated through his head like a song on repeat. Another gentler voice pierced the darkness of doubt and fear. He knew that voice. It was with him since his childhood and always sheltered him from everything in the world. A woman with blonde hair all too similar to his own appeared in his head. It was clear that time was quite gentle to her since she looked quite young for age.

'Finn, my little angel, you don't have to worry about anything as long as you have that sword with you. It will always protect you, my dear little hero, even when I…'

Gritting his teeth, the boy grabbed his sword and slowly walked in front of the shop. He heard an older man's voice accompanied by a younger yelp that sounded feminine. Finn didn't know what pushed him to hurry

Jumping through the window, he bore witness to the surprised visage of an elderly man and a girl that was maybe 2 or 1 years younger than Finn was. The elderly man was the strangest out of the duo. He had long white hair and a beard that went way past his sternum. These features didn't match his clear lack of wrinkles on his face that would come hand in hand with his white hair and beard but nevertheless, the most glaring issue was his light blue skin and sharp goblin-like nose. Apart from that, he was equipped as any peaceful survivor with a large backpack and simple black suit to travel in. As he peered closer at the man, he noticed a strange crown strapped to his hip but he didn't deem it as an immediate threat right now.

The girl had short black hair and was dressed in a rather simple blue overall dress, a red shirt, and simple black boots. The girl seemed quite pale and had a runny nose as she hid behind the strange man like a daughter would do when meeting strangers. The young boy noticed that there was an unmoving undead creature laying behind them and he said with a bit of apprehension in his voice.

"Hey… I am Finn"

"Hello, Finn. I am Simon Petrikov and this girl behind me is Marceline, Marcy for short" Simon said as he gently urged the girl behind him to step forward and Marcy slowly waved her hand in greeting. Simon smiled and asked the young boy in apparent worry.

"Now Finn, you seem lost. Do you need help finding your parents?"

Finn's shoulders visibly shook as tears threatened to spill down his face but he withheld the urge and shook his head and said with a strained smile.

"Thank you Mr. Petrikov but my parents are either…dead or didn't exist in the first place. I am just searching for any like-minded survivors…"

"I am… sorry to have made you remember that Finn," said Simon as Marceline's eyes slightly widened at the sentence before Simon continued "What do you mean by like-minded survivors?"

When Simon asked that question, Finn was shaking in fear as he remembered those tragic days. People deformed and mutated rushing at him with spikes and clubs ready to bash his brains in and eat him alive. Others who were not afflicted by the radiation, betrayed him when he was at the lowest point in his life and left him to the Oozers or any other environmental threat. Although he survived by sheer luck and determination, it still left a deep wound in his childish psyche that was covered by his kind and forgiving nature and his mother's sacrifice. Finally, Finn put on a strained smile and said.

" Let's say there aren't many good people remaining in this world."

" Oh. I am so sorry to hear that, boyo. I thought that the war would unite humanity to survive but ha I guess we are still the same." He said as he gently patted Finn on the shoulder. Finn didn't squirm at the touch, he felt a strangely cooling feeling in his heart and it didn't come from the chilly hands that the old man had. It felt oddly relaxing and calming as if he met a kindred spirit. Finn chuckled a bit and said quietly.

"Yeah… I think it's best if we get going right now unless we want a pack of Oozers on our back from your earlier motorcycle stunt" Simon visibly blushed at that comment and Marceline released a short yet cute giggle. The small team left the empty soup shop in a hurry as they slowly walked across the paved roads. As they walked across the empty streets, Finn noticed a short sneeze escaping from Marceline and said.

"Marceline, are you okay?" Marcy slightly blushed at the good-natured question and said shyly to Finn.

"Yeah, I just caught a cold. Simon said he will get me some chicken soup to help me" Simon chuckled a bit with Marceline and Finn slowly paused in his hands as he rummaged through his cloak, looking for something specific. The duo stopped for a bit and Finn scooped out a small can that had a small label resembling a chicken in a bowl.

"It's not much but if it can help you deal with your flu. Here you go!" Finn said as he extended his hands to Marceline. Simon's smile widened as he bent down and hugged Finn with the gentlest pat on the shoulder as a…father would.

"Thank you, Finn. I don't think we would have found anything of worth in this city." Simon said as he parted from the hug and gently fed Marceline the chicken soup. Finn wondered what made him think of Simon in that light. As Finn was consumed by his thoughts, Simon finished feeding Marceline who released a cute burp accompanied by a soft giggle. Simon grabbed Marceline's hand and extended his other hand to Finn. After a bit of deliberation, Finn smiles and grasps the hand

'Is it his kindness? My naivety? The way he acts with Marceline? I don't really know nor do I really care,' Finn thought as he took his first steps in finding who he was and his purpose in this post-apocalyptic world. Clutching the sword in one hand and the hand in the other hand, the young man smiles at Simon and Marceline as they giggle together.

-

Disclaimer: I don't own Adventure Time (I don't know why people do this but it's tradition so I guess…)

I had to make some proper adjustments to Finn's Character and Backstory since his happy-go-lucky attitude wouldn't exactly match the post-apocalyptic feel of the world. I don't want to make him too out of character but I tried keeping as much from his background and attitude as possible. I know that the interaction between the trio may be slightly forced and rushed but I still believe that Finn would still fall under the same traps that he did in the original show (being too forgiving, impulsive, naive, etc.)

Anyway, goodbye folks, and remember to keep a smile on your face as always.