- Shu Matsuda is known as his best disciple. Matsuena even produced an animated CM to promote his disciple's debut work. Their art styles are almost the same.
- His publisher romanizes his given name as Syun, while Matsuena himself tends to use Shun most of the time.
- He voiced the robot in Waza no Tabibito.
- The composer Tenmon was his senior in high school.
- The year of his birth is unknown, but he has stated that he was 19 years old when The Gate to Valhalla was published.
- He is good friends with Tarô Nogizaka (Team Medical Dragon).
- He produces and directs 3D animations of his works.
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