Sunao comes across as genuinely troubled. The "Insomnia" music video presents him as jaded and world-weary, and it's pretty clear the song explores darker territory—he attempts suicide in the video, though it doesn't succeed. Fans have noted the desperation in how Eve frames his character here.
Beyond that darker material, Sunao's actually pretty timid and anxious. In sketches Mariyasu posted to Eve's official Twitter, he's shown as nervous and overthinking everything. He had a rough first impression of Tobi, immediately labeling him as scary, which says something about how anxious he naturally is. He also gets uncomfortable with attention and being noticed, particularly self-conscious about his height standing out among the others.
Content compiled by AnimeList.moe from publicly available sources.
