Iron Knight is a manga that has just been serialized in Weekly Shonen Jump. There's only been 5 chapters so I'm only judging on the five chapters that have come out.

Story (5/10): The story is about a 10 year old kid called Teppei. He wakes up one day in a post-apocalyptic world runned by goblins that eat humans. Apparently somehow he's able to turn into an iron skinned goblin hence the name "Iron Knight." With his new power, he's currently trying to find his parents that disappeared overnight.

Art (8/10): There's really nothing special. The drawings are pretty good.

Character (6/10): As for right now, there's not a big variety of characters. There's only the main character. Teppei is EXTREMELY naive. The main character is 10 so it explains his naivety.

Overall, this story is a near ripoff of Attack on Titan. The plot elements are the same except a couple things: lacks the darkness aspect, the character is very naive, and not really amazing action scenes.