Yuji Iwahara is a Japanese manga artist and original creator born in Memanbetsu, Hokkaido. Before entering the manga industry, he graduated from art school and worked as a graphic artist for the video game company Hudson Soft, contributing to titles such as Mega Bomberman. He made his manga debut in 1994 after winning the fall Afternoon Four Seasons Award, a prize he would go on to receive three more times over the following two years.

Iwahara is recognized for creating several original manga series that have been adapted into anime. He is the creator of King of Thorn (Ibara no Ō), a science fiction fantasy manga serialized from 2002 to 2005, which was later adapted into an anime film. His near-future science fiction action manga Dimension W ran from 2011 to 2019 and was also adapted into an anime television series. His ongoing work, Clevatess -Majū no Ō to Akago to Shikabane no Yūsha-, which began serialization in 2020, represents another original property that has received an anime adaptation.

Beyond his original works, Iwahara has contributed significantly to established media franchises. In 2007, he provided the original character designs for the acclaimed anime television series Darker than Black and its sequel, Ryūsei no Gemini. He later expanded on this universe by creating the spin-off manga Darker than Black: Shikkoku no Hana, which he both wrote and illustrated from 2009 to 2011. Earlier in his career, he created the manga adaptation for the video game Koudelka, a project on which he had also worked as a character designer.

His other notable manga series include Cat Paradise (Gakuen Sōsei Myōchō), serialized in Champion RED from 2006 to 2008, and Chikyu Misaki, both of which have been released in English. In the early 2000s, he was attached to draw Quest, a title for the Marvel Comics imprint Tsunami, though the series was cancelled before any issues were completed.

Iwahara’s artistic identity is characterized by a distinct style that often employs strong black-and-white contrast with minimal use of screen tones, resulting in a clean yet atmospheric visual presentation. His body of work predominantly resides within the science fiction and fantasy genres, frequently exploring near-future settings and incorporating elements of occult fantasy. His significance in the industry stems from his dual role as a creator of original manga properties that garner anime adaptations and as a sought-after character designer for major anime productions, bridging the two mediums throughout his career.