This is a story I would love to see in the Hetalia anime. I tried to depict it visually as best as I could. Only Serbia is my OC. The other characters you can check on Yugotalia or other Hetalia info sites. Hope it makes you laugh :)
A chibi young woman with brown hair and greenish-brown eyes twirls her way onto a bright colorful background and starts speaking in Japanese.
"Hello! I'm Serbia. Nice to meet you. Let me introduce myself!" she says smiling cheerfully putting her hand near her heart.
She floats to the side of the screen and a map of the Balkans appears next to her.
"This is the Balkans. A great place to live."
She points with a stick to show where Serbia is on the map which is highlighted with red blinking boarders.
"This is me. I wasn't always so small. Up until the late 80s I lived in a huge house called Yugoslavia."
As she says that the former Yugoslavia is highlighted with red boarders.
She floats to the center of the screen and the map disappears.
"And I didn't live alone. I shared it with Macedonia, Montenegro, Bosnia and Hercegovina, Croatia and Slovenia. (Chibi heads of all these countries appear and start cheerfully tilting left and right one by one as she mentions them.) We were all roommates." she adds with a big cheer, spreading her arms.
The smiling faces disappear as she continues her story.
"Back then many nations didn't get along. (She shakes her slightly bowed head.) But luckily I was good with everyone! I had a chance to travel a lot and meet many different nations" she continued in the same happy tone.
Next scene: A scene of Russia (Soviet Union) and Serbia laughing and walking covers the screen. She narrates: "Our relationship with the Soviet Union was great." She says as we see them laughing and talking. They are both in their normal forms.
Next scene: "And we even traded with the USA." We see them shaking hands. America asks Serbia: "So, you say your cars are cheap and reliable?"
"Yes! They're the best!" she says with a genuine smile.
"That's great. I think we can make a deal" America says shaking her hand.
Serbia's narration: "To tell you the truth, negotiations were only part of my job."
Next scene: Serbia is in chibi form again. She leans towards the camera, puts her right hand near her mouth and winks: "And do you want to know what my other job was?"
She leans back and flies off the screen. Moments later she appears in a blue postal uniform with a big postal bag.
"An international postman!" she yells.
The scene changes from a colorful background to a scene where Serbia (now in normal form) walks down a large nicely decorated corridor. Her narration is heard:
"Not a regular postman, of course. I used to deliver very important and sometimes very private documents and packages."
We see sand and a Pyramid in the distance. Egypt is waiting for someone. Serbia appears, greets him and gives him a package. She then leaves. Britain pops out from behind the pyramid and tries to sneak something out. Egypt notices him and starts chasing him with a slipper.
Next scene: She does the same thing with China. Zambia. Cambodia. India. She gives them all mail respectively and waves goodbye.
Next scene: Serbia is taking off her shoes before entering the living area.
"I'm home", she says tired and walks into the living room.
"Welcome home!" Macedonia greets her. She is sitting with Bosnia and Montenegro and they are all drinking coffee and watching TV.
"Care to join us?" Bosnia offers her a seat.
"I'm too tired. I need to sleep. I'm sorry" she says and bows. Serbia then stands straight and looks around.
"Where's Slovenia and Croatia?"
"They're in their rooms" Montenegro replies.
Next scene: Slovenia is reading in his armchair when he hears a knock on the door.
"Enter" he says with a melancholic voice.
"Hi, Slovenia. Sorry to bother you but I have some letters for you" she says approaching the armchair and hands him two letters.
"Oh, thank you. They mixed me up with Slovakia again?" he says looking at the letters.
Serbia nods: "Also Slovakia asks if you have any of his letters."
"Just one this time" Slovenia opens a drawer and gives her the letter.
"Thanks, I'll give it to him tomorrow" she says and smiles politely.
Slovenia smiles back. They stay like that for a few seconds.
The word "Awkward silence" appears above their heads.
"We don't have a lot to talk about, do we?" Serbia says.
"Unfortunately, no" Slovenia sighs.
"Well, I'll be going now" Serbia smiles.
"Alright" Slovenia smiles again.
Next scene: Croatia is playing his guitar in his room. His head is bobbing to the guitar sounds.
Serbia knocks on the door but after not getting an answer she yells: "Hey Croatia, can I come in?"
Croatia sighs annoyed: "Come in."
Serbia slightly opens the door and says: "Hi! I'm a little tired today. I was very busy. So, I'm going to bed and I would appreciate it if you would tone down your playing just a little."
Croatia roles his eyes and continues plucking the guitar strings a little quieter this time.
"Thanks, I guess" Serbia says with a dissatisfied look on her face and closes the door.
Next scene: Serbia is in her own room right now. After doing her nightly routine she bellyflops into her bed.
"So soft" she says before dozing off into dreamland.
Suddenly, a loud guitar riff wakes her up.
"CROATIAAAAAAAA!" she screams at the top of her lungs.