Mecha manga - Status completed

From Dark Horse:Dark Horse proudly presents another of the crown jewels of international graphic fictionAstro Boy! Created by the late Osamu Tezuka, a revered animator and cartoonistwho created over 150,000 pages of comics in his career!and considered the Walt Disney of Japan, his Astro Boy was the first manga series to be adapted to animation and became a worldwide phenomenon, making Astro Boy the Mickey Mouse of animea jet-powered, super-strong, evil-robot-bashing, alien-invasion-smashing Mickey Mouse, that is!Exciting, whimsical, and touching, Astro Boy hearkens back to the classic era of comics and animation, featuring stories that readers young and old will enjoy.

Official 4-koma manga for Darling in the FranXX.

From: Easy Going ScansA Demon Lord spirited the Princess away, and cursed her with eternal sleep. Countless knights sought to save her, only to die in vain by the Demon Lord's hands. But then, a Nameless Knight arrived to vanquish him and save the Princess, ignorant of what fate had in store for him...

Following the Tuatha de Danaan's seajacking incident, things are back to normal at Jindai High School in Tokyo, or as normal as they get with Sousuke guarding Kaname. After finding out who betrayed Mithril and caused the seajacking incident, Kurz and Mao are sent on a top secret mission in order to capture and bring the traitor back.However, Sousuke and Kaname's lives are about to change when they meet Leonard Testarossa, a high ranking member of a mysterious group named Amalgam. After their meeting, Leonard warns her that he would do anything to recruit her even if it means war in the streets of Tokyo.

From Amazon.com: Any pairing of two masterminds can elicit murmurs of approvalor of apprehension. But all readers can rest assured that in this case, the pairing of seinen manga suspense master Urasawa and legendary cartoonist Tezuka is a very, very good thing. In a distant future where sentient humanoid robots pass for human, someone or some thing is out to destroy the seven great robots of the world. Europol's top detective Gesicht is assigned to investigate these mysterious robot serial murdersthe only catch is that he himself is one of the seven targets.

From MangaHelpers: The world is in a war against an alien race called "Mimics," who have taken over most of the world with a mission to eliminate the human race. Keiji Kiriya is a new recruit in the United Defense Force, which is battling against these "Mimics." On his first day of deployment, Keiji and his unit encounter "Mimics" and are all killed... Or was it all a dream? For some inexplicable reason, after every time he dies, he is resurrected and returned back to the day before the battle. Why does this happen to Keiji and how can he escape from this never ending cycle?