Short answer:
Most people asking “who made Monster” today are either talking about the Monster anime/manga or Monster Energy drink. The anime/manga Monster was created by Japanese manga artist Naoki Urasawa, and Monster Energy was developed by Hansen Natural Company (now Monster Beverage), led by Rodney Sacks and Hilton Schlosberg.

What “who made monster” usually refers to

Because “who made monster” is very broad, it often points to a few trending things:

  • The Monster anime/manga (a cult-favorite psychological thriller).
  • Monster Energy drink (the black can with the green claw logo).
  • The 2023 Japanese film Monster by Hirokazu Kore-eda.
  • Occasionally, people mean “Monsters, Inc.” or other “monster” titles.

Below are the main possibilities, so you can match them to what you had in mind.

1. The Monster anime / manga

If you mean the psychological thriller anime/manga about Dr. Tenma and Johan Liebert:

  • Creator: Naoki Urasawa, a Japanese manga artist.
  • He wrote and drew the original Monster manga, which later got adapted into the 2004–2005 anime series.
  • Urasawa also created the related spin-off novel Another Monster.

So if your question came from anime forums or watchlists, the answer is: Naoki Urasawa made Monster.

2. Monster Energy drink

If you’re talking about the energy drink with the claw “M” logo:

  • Brand origin: Created by Hansen Natural Company, an American beverage company, in April 2002.
  • The company’s roots go back to Hubert Hansen , who started Hansen’s juice business in 1935.
  • Key modern figures behind Monster’s rise are Rodney Sacks and Hilton Schlosberg , South African-linked businessmen who bought Hansen’s in 1990 and later launched the Monster Energy brand.
  • In 2015, The Coca‑Cola Company took a 16.7% stake in Monster Beverage Corp, helping push the brand globally.

So if your question came from a can in your hand, the practical answer is: Hansen Natural Company created Monster Energy, driven by Rodney Sacks and Hilton Schlosberg.

3. The 2023 Japanese film “Monster”

If your question came from recent movie talk:

  • Director/editor: Hirokazu Kore-eda.
  • Screenwriter: Yuji Sakamoto.
  • The film is a psychological drama about a mother, her son, and a teacher, and was notable for being Kore‑eda’s first film in a while that he did not write himself.

In that case, the answer is: Hirokazu Kore-eda directed Monster , from a script by Yuji Sakamoto.

4. If you meant something else

“Monster” appears in lots of titles: games, songs, novels, other movies, and of course “Monsters, Inc.” from Pixar. If you tell me:

  • whether you mean an anime/manga ,
  • a drink ,
  • a movie , or
  • something like a song or game ,

I can narrow it down to the exact creator you’re looking for.

TL;DR:

  • Monster anime/manga → Naoki Urasawa.
  • Monster Energy drink → Hansen Natural Company , led by Rodney Sacks and Hilton Schlosberg.
  • 2023 film Monster → Hirokazu Kore-eda (director) and Yuji Sakamoto (writer).

Information gathered from public forums or data available on the internet and portrayed here.