Jumbor Barutronica

Jumbor Barutronica is a Shonen manga by Hiroyuki Takei (Shaman King and Karakuridouji Ultimo) that is currently running in Ultra Jump. It has had several different versions, all with different storylines, but similar characters.

Baru Crow is a 36 year old construction worker, who leads a team of fellow builders who travel around doing different construction jobs. At the same time, a robotic looking man named Genber Diode has appearred on the news, talking about a world construction plan, and fixing all the problems humanity has caused. He summons more robotic creatures called jumbors that are all over the world to destroy everything, and start rebuilding a new world. As the chaos starts Baru and the gang get caught up in everything as well.

Despite the army's efforts the world is wiped clean in the end. Genber finds Baru buried in the rubble, and due to his construction skills, decides to use him to create a the eleventh jumbor.

Ten years pass, and and Jumbor Baru has been stolen by the old world's leader's daughter, Rivetta, who plans to use him to stop Genber and return the world to normal. But Baru is less than enthusiastic, wanting to find his missing wife and kids, and find a way to get his old body back. Baru sort of agrees to help Rivetta, only in hopes that it will help him find his family.

Arguably the Spiritual Successor to Karakuridouji Ultimo due to similar character designs and battle styles.

This manga provides examples of:

 * Adult Fear: Baru is pretty much told not to bother looking for his wife and kids since they probably died with the other 90% of the world.
 * After the End / End of an Age: It takes place in year 10 of the new world.
 * Badass Automaton: The Jumbor.
 * Barbie Doll Anatomy
 * Big Eater: Baru
 * Expy: Just like Ultimo is filled with Shaman King expies, Jumbor is filled with Ultimo expies.
 * Baru is like an older Yamato, while Jumbor Baru is a grumpier, black haired, Ultimo.
 * Vice is an expy of, well Vice.
 * Kili is basically a white haired Machi.
 * Rivetta is like a blonde, female Miryuu.
 * Gag Boobs: Occasionally Rivetta.
 * Hot Scientist / Nerds Are Sexy: Rivetta
 * Humans Are Bastards: Genber pretty much states it's humanity's fault for all the world's problems. (Hunger, overpopulation, war, ect,)
 * Kid Hero: Subverted with Baru. He has the mind of an adult, but his new body is aged to that of a 10-year-old boy.
 * Male Gaze: Rivetta has gotten a couple of these moments.