He'd be curious. Harry has always been interested in new things related to magic. So he'd likely start reading with great interest, but might soon be shocked by some of the more extreme elements in Soul Eater.
Black Star would probably see Asura as a new opponent to prove his strength against. He would be eager to fight, shouting his usual boasts about being the one to defeat the most powerful foe. However, he might quickly realize that Asura is on a whole different level and would need to rely on his friends more than he thought.
I think it is. The plot has depth, the action scenes are exciting, and it has a good mix of humor and drama. However, it might not be for everyone depending on personal preferences.
The arc where Death the Kid battles against the Kishin. It's intense. Kid, with his OCD and unique fighting style, goes all out. His dual pistols, Liz and Patty, are amazing companions. The fight scenes are well - animated and the story around this battle delves into the deeper lore of the Soul Eater world, like the true nature of the Kishin and the role of the Shinigami. It's really exciting and a standout story in the series.