Board Thread:Questions and Answers/@comment-75.104.45.150-20170827025256/@comment-918376-20170827135124

http://www.crunchyroll.com/anime-news/2013/01/06/a-visual-guide-to-the-seven-versions-of-maoyu

Since you're specifically asking about the manga:


 * Maoyuu: Maou Yuusha - "Be mine, Hero" "I refuse!" (Akira Ishida) is probably the most thorough of all the different manga, and is also completed (in Japanese). It's also the only manga adaption with an official English translation.
 * Maoyuu Maou Yuusha - Other side of the hill (Hiro Touge) is one that I don't think I've read, but it's just another adaption of the light novel. Somehow, it's even more fan-servicey than the other adaptions.
 * Maoyuu Maou Yuusha (You Asami) is again, just an adaption of the light novels. It's more condensed than Akira Ishida's version.
 * Maoyuu 4-Koma: You're Horrible, Maou-sama! (Muronchi Nanatsu) is a 4koma anthology, so it's going to be more comedic and light-hearted. It's not a direct adaption of the light novels.
 * Maoyuu Maou Yuusha Gaiden - Madoromi no Onna Mahou Tsukai (Taiki Kawakami) is a side-story manga that follows the Female Magician's story immediately after Hero left his team to challenge the Demon King alone.

So yes, they're all by different artists, but most of them follow the light novel's story.