It's likely about the concept of Exterminatus in the Warhammer 40,000 universe presented in a graphic novel format. Exterminatus in Warhammer 40K often involves the total destruction of a planet or area. So the graphic novel might depict the events leading up to, during, and after such a cataclysmic decision.
I'm not sure specifically as I haven't read this graphic novel. But it could be Space Marines. They are often central in Warhammer 40K stories related to big events like Exterminatus.
It might be related to a caricature or illustration depicting President Roosevelt and the famous Great White Fleet. Maybe it shows some significant event or aspect associated with them.
Mexican comics are known for their diverse storylines. They might focus on adventure, comedy, or drama, and often reflect the unique cultural background of Mexico. The illustrations can be highly stylized to capture the essence of the tales being told.
Honestly, I can't find any obvious connection between Spumoni and Cartoon Cat. They could just be two unrelated things that have no relation to each other in any significant way.
Black and white ninja cartoons often have a stark contrast that adds to the mystery and intensity. The use of limited colors can focus attention on the action and expressions of the ninjas.