Akatsuki cloud means: Akatsuki, an evil group from Naruto’s anime Naruto is known as. Their uniforms are black cloaks and red clouds. This is why they’re called “Akatsuki cloud”. Fans of Naruto love the Akatsuki clouds. Many of these fans buy red cloud-colored cups, scarves and t-shirts to express their love for the Akatsuki. (in Community Dictionary, added by Diamond Friedman)