Infinite Competitive Dungeon Society 
Thinking about it now, the story is not even good and rather trash towards the end. But I loved the idea so much that I wrote my own dungeon story. Somewhat a fanfiction of this one. This was the first time I wrote anything longer than 1k words. It helped me improve my English skills significantly that I got top grades in school. 

Don't know if I can narrow it down to a single book or author. For me it was classic sci-fi by authors like Asimov, Heinlein, Bradbury, and Doc Smith. The worlds and ideas they came up with just drew you in and made me want to do the same.

I'm not exactly sure which writer was the first one to inspire me to start my writing journey, as I started writing poetry first before moving to prose. However , I do have a few inspirations today that do make part of who I am as a writer:
- Pablo Neruda 
- Gabriela Mistral 
- Rick Riordan 
- Tolkien 
- Langston Hughes
- Brandon Sanderson
- Eichiro Oda 
- Kentaro Miura 

Harry Potter, Percy Jackson, Robert Langdon, and Mortal Instruments. I read these series all at once back-to-back and got hooked with the fictitious worlds that they presented. But the series that made me want to write and create a fantasy world on my own was Fable Haven by Brandon Mull.  

George R.R. Martin's ASOIAF (A Song of Ice and Fire) series pretty much gave me the thought of writing. 

How the characters and relations were written hooked me and how the world was built reeled me in, reading the lore of ASOIAF's world feels like reading history, I love it! and I want to make something like that!

La Planète des chats (Les chats #4) by Bernard Werber

Heard about it as I began to write KITTY KITTY

I read a lot of fantasy (and mystery) growing up as a kid but I think the books that influenced me the most was Brian Jacques's Redwall series. I liked the way that each book in the series told a different part of the lore of the world and it wasn't all in order and how detailed his world and characters were.

None. I wanted to be an author for a very long time, but thought I can't do it, thought I am too stupid or incompetent to write fiction. 

Then I started reading webnovels, and realized that incompetence didn't stop any of these people from posting this garbage online. so it shouldn't stop me, either.

Paradoxcloud Wrote: A book called The Alchemist. 

It was so gobsmackingly terrible yet so popular that I had to give writing a go.

Ah yes, Paulo Coelho. 

Sake Wrote: None. I wanted to be an author for a very long time, but thought I can't do it, thought I am too stupid or incompetent to write fiction. 

Then I started reading webnovels, and realized that incompetence didn't stop any of these people from posting this garbage online. so it shouldn't stop me, either.

Great attitude to have really. 

Nilonyan Wrote: George R.R. Martin's ASOIAF (A Song of Ice and Fire) series pretty much gave me the thought of writing. 

How the characters and relations were written hooked me and how the world was built reeled me in, reading the lore of ASOIAF's world feels like reading history, I love it! and I want to make something like that!

Have you read all five books? It must be excruciating waiting for his sixth and seventh book? 

Also, have you tried Joe Abercrombie's First Law Trilogy? I believe you'd also like that as well. 

Child 44 by Tom Rob Smith

I'd always loved reading, but that book really took me to a new place.

It was actually a friend! She gave me a college-ruled notebook with a checkered cover in third grade and told me she wanted to start a writing club with me where we made stories. I had great difficulty writing back them but it really helped me out and got me hooked on writing. I still have the notebook :)

Enlornder Wrote: ¡En realidad era un amigo! Me dio una libreta con rayas universitarias y una cubierta a cuadros en tercer grado y me dijo que quería comenzar un club de escritura conmigo en el que hiciéramos historias. Tuve grandes dificultades para escribirlos, pero realmente me ayudó y me enganchó a escribir. Todavía tengo el cuaderno :)

Que bonito lo que falta es que sea una amiga y al final terminen siendo pareja y pum novela de amor

AuthorMarcel Wrote:

Nilonyan Wrote: George R.R. Martin's ASOIAF (A Song of Ice and Fire) series pretty much gave me the thought of writing. 

How the characters and relations were written hooked me and how the world was built reeled me in, reading the lore of ASOIAF's world feels like reading history, I love it! and I want to make something like that!

Have you read all five books? It must be excruciating waiting for his sixth and seventh book? 

Also, have you tried Joe Abercrombie's First Law Trilogy? I believe you'd also like that as well.

I am at the middle of A Feast for Crows and planning to continue again, and for me at least, I am not that hung up because I haven't even gone up to date lol.

And I'll check it too if I have the time.

The Otherlife Series.

Carlo Zen's Saga of Tanya the Evil (Youjo Senki) compelled me to start writing more seriously. Without reading/watching the LN/anime I would still be lingering around fantasizing and writing worldbuilding things without any foundation.

For me it was actually Overlord, I think that the idea of an MC being evil just really inspired me to do something similar. 

It was back in middle school for me. At the time, it was Da Vinci Code and Eragon that got me interested and I started dabbling in a (horribly bad) story. Eventually, I read Terry Brook's Shannara series and the Dragonlance Chronicles and that got me hooked. Classic high fantasy with good storytelling and world building and that inspired my style of writing. 

Peanuts, Charles Schultz   I taught myself how to read with a collection of his comics.
Soon after I got a hold of some lurid horror comics from the 50s, before the comic code bans forced comics to be tame. My aunt owned an antique store and she had hundreds of them. They fed my imagination something fierce.
I started doodling my own comic stories.
Local pharmacy carried DC comics. I was hooked on the Green Arrow. 
By eight I was into books. Except for Nancy Drew, I skipped children's lit altogether.
Dune, Chronicles of Amber, Babel-17, Starship Trooper, Stars My Destination, Illustrated Man, Ringworld, Dorsai, Deathworld, A Scanner Darkly were my earliest reads.