Yuuki, Masami

In the near future, large mecha called Labors are made to assist in various reconstruction projects in major countries around the world that are being threatened by global warming. In Japan, the government has enacted Project Babylon in order to conduct land reclamation. Labors are also being pressed into police and military service aside from civilian use.

However, terrorists are now attempting to use labors to make themselves heard, as well as common criminals, thugs and guerrillas. The National Police Agency established the Special Vehicles Division, an all-labor task force to combat the potential use of labors for criminal/terrorist activities.

(Source: MU)

Kidou Keisatsu Patlabor

Mobile Police Patlabor

機動警察パトレイバー

Adachi, Mitsuru

The story is set in a place very similar in appearance to Earth in the Edo period. However, Adachi (the mangaka) regularly reminds the reader all throughout the series that the setting is another planet in the distant future which just happens to look like Earth.

After the death of his mother, Shichimi sets out to join his step-brothers and -sister who live together in Karakuri Tenement, a place provided by the father they have never met. He finds out that each of them had different mothers (all of whom have died), but were fathered by the same man. Not long after Shichimi's arrival, the siblings decide to journey to visit the graves of each of their mothers. On this journey, they encounter many dangers.

(Source: Wikipedia)

Nijiiro Tougarashi

虹色とうがらし

Manabe, Jouji

It`s face-to-face confrontation when Kahm stares down her father and refuses to end her relationship with Tetsuya. In retaliation, her father sends a punitive fleet to Earth -- with orders not only to crush the rebellion but to annihilate the entire solar system!

(Source: Amazon)

Outlanders

アウトランダーズ

Shirow, Masamune

Set in the fictional city of Newport, Japan, in a future in which bacterial air pollution has become so severe that people must wear gas masks when outdoors, the series follows a police squadron that uses tanks.

(Source: Wikipedia)

Dominion

DOMINION

Ishikawa, Ken

An bonus chapter included with the final volume of Getter Robo Āḥ. Dr. Hell discovers a biomechanical lifeform known as "Kedora" in the depths of Bardos Island, and realises that he can use it to fight Mazinger Z. 

The story of this chapter was loosely adapted into the sixteenth episode of Shin Mazinger Shougeki! Z-Hen.

Mazinger Z : Relic of Terror

Nagai, Go

One of the first Super Robot manga and the one that introduced most of the traits of the Mecha genre. Constructed with the Super-Alloy Z, Mazinger was built by Professor Juzo Kabuto as a weapon against the Mechanical Beasts of the evil Dr. Hell. Koji Kabuto, the grandson of Professor Kabuto, becomes the pilot of Mazinger Z when his grandfather is killed, and battles from there on against Dr. Hell and his allies. This is the first series that introduced the concept of a pilot inside a Mecha, which all series from then on have followed.

(Source: MU)

Mazinger Z

マジンガーZ

Ishinomori, Shoutarou

An evil secret society called the Black Cross Army threatens world peace, and only an elite task force known as the Earth Guard League (EAGLE) can stop them. After the Black Cross Army destroys EAGLE's headquarters across Japan, only five young recruits survive. Hiding in a secret underground base, they are given enhanced battlesuits that empower them with superhuman abilities, transforming the youths into an unstoppable squad to combat evil.

(Source: Seven Seas Entertainment)

Himitsu Sentai Gorenger

Super Sentai: Himitsu Sentai Gorenger

秘密戦隊ゴレンジャー

Obata, Takeshi

His name is Tokijirou Kaizou, a brilliant scientist who has decided to spend his waning years taking things much easier: caring for his family, farming on his own plot of land...and transforming himself into a 2000-horsepower cyborg!?

(Source: OneManga)

Included one-shots:
Volume 3: Cyborg Jiichan Gaiden (pilot)
Volume 4: Long Shoot

Cyborg Jiichan G

CYBORGじいちゃんG

Matsumoto, Leiji

Collection of short, humorous stories by Leiji Matsumoto.

Wadachi

ワダチ

Hasegawa, Yuuichi

Every school has its own ghost stories, and in this particular school there was an "always-locked-room." One day bunch of bored students decided to break into that locked room by any means. But they didn't know that the thing that was concealed in the locked room was a giant spaceship.

Included one-shots: Manatsu no Senshi, Nessie 2001

Bemader P

BEMADER・P

Inui, Haruka

Akashi, Noboru

Mirai Keisatsu Urashiman

未来警察ウラシマン

Hidaka, Yuuki

Setsuna Rei has a special tattoo on the palm of his hand that allows him to go back in time and change history.  He uses this special power to earn his living.  For a fee he will go back in time to change the course of history for a client.

12 Manga Like Tetsuwan Birdy