Mecha

Genre: Action, Drama, Mecha, Sci-Fi
Episodes: 26
Type: TV Series
Age Rating:   Teen +13  

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Heroic Age Episodes Online

Following the call of the “Golden Tribe” many different races advanced into the universe. The last to accomplish that significant step is humanity henceforth given the name “Iron Tribe”.
A long time passes peacefully but now the dawn of a new era has begun. The appearance of the prosperous and powerful “Silver Tribe” threatens the very existence of humanity itself.

Princess Dianeira sets out to travel the Milky Way as proclaimed by to the prophecy of the “Golden Tribe” handed down many generations in the royal family. During her travels the Princess meets a boy named Eiji (or Age). This chance encounter will bring forth great change in the fate of the entire universe.

Genre: Adventure, Drama, Mecha, Sci-Fi, Military
Episodes: 12
Type: TV Series
Age Rating:   Teen +13  

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Innocent Venus Episodes Online

In the year 2010 AD, Hyper Hurricanes born concurrently all over the world caused severe damage. Five billion people lost their lives, decreasing the world's population to 3 billion. Existing economies and militaries were wiped out. Countries were frozen under solid ice, plains sank beneath seas, the world was changed dramatically. Human civilization enters a chaotic era. Poverty flourished outside of these ecomomic zones and slums were widespread. The ruling class called themselves Logos and maintained their position by force of arms. They call the poor Revenus, who are exiled to live outside the special economic areas. Time has passed since then. Katsuragi Jo and Tsurasawa Jin, escape from Phantom, a force organised to watch Revenus and to suppress renegade elements of the Logos, taking with them a mysterious girl, Noto Sana. There are many who are interested in her, all with their own reasons.

Genre: Adventure, Mecha, Sci-Fi, Shounen, Space, Military
Episodes: 5
Type: OVA Series
Age Rating:   Teen +17  

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English: Macross Zero

Macross Zero Episodes Online

Taking place one year before the Zentraedi arrive on Earth, Macross Zero chronicles the final days of the war between the U.N. Spacy and anti-U.N. factions. After being shot down by the anti-U.N.'s newest fighter plane, ace pilot Shin Kudo finds himself on the remote island of Mayan, where technology is almost non-existent. While Shin stays on the island to heal his wounds, the tranqulity of the island is shattered by a battle that involves the UN's newest fighter - the VF-0. (Source: ANN)

Genre: Adventure, Mystery, Mecha, Romance, Sci-Fi, Shounen, Space, Military
Episodes: 36
Type: TV Series
Age Rating:   Everyone  

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Genre: Action, Mecha, Sci-Fi
Episodes: 24
Manga: Read Kurogane no Linebarrel Manga Online
Type: TV Series
Age Rating:   Teen +17  

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English: Kurogane no LineBarrels

Linebarrels of Iron Episodes Online

Based on a shounen manga written by Shimizu Eiichi and illustrated by Shimoguchi Tomohiro, serialised in Champion RED.

Kouichi Hayase was involved in an accident and falls into a coma for half a year. Due to this accident he becomes depressed and lonely. However, unbeknownst to him he attained a great power and three years later a giant robot (Linebarrel), which was the cause for the incident, appears before him, causing Kouichi`s life to change.

(from AniDB)

Genre: Action, Mecha, School, Sci-Fi
Episodes: 12
Type: TV Series
Age Rating:   Teen +13  

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English: Ride Back
Synonyms: Rideback

Ride Back Episodes Online

Ride Back is about a girl who is the daughter of a famous dancer. During one of her performances she falls and then quits her dancing career. Some time later when she joins the Theatrical Academy, she finds out about a Ride Back club and then rides the bike to waste some time because of the very rainy weather outside. But something is wrong with the bike and she looses control. While trying to stop she finds out that the bike responds to her movements. She is able to sort of dance with the bike and gets inspired by it.

Genre: Action, Mecha, Sci-Fi
Episodes: 24
Type: TV Series
Age Rating:   Teen +13  

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Casshern Sins Episodes Online

In the distant future, where cyborgs and humans struggle to survive after the war which destroyed the world, a being in white suit awakens. His name is Casshern and he remembers nothing of his own past.

In barren and dark dystopian world, where every being alive seems to hate his existence and the evil from his past wants him dead, Casshern, haunted by the flashes of his past memories has to survive and figure out who or what exactly he is and how he got to where he is now. But he does not know that he might not like the horrible truth of the past, hidden deep inside his mind...

Created as an intended reboot of Casshern franchise.

Genre: Action, Comedy, Mecha, Sci-Fi
Episodes: 24
Sequel: Full Metal Panic! The Second Raid
Side Story: Full Metal Panic? Fumoffu
Manga: Read Full Metal Panic Manga Online
Type: TV Series
Age Rating:   Teen +13  

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English: Full Metal Panic!
Synonyms: FMP

Full Metal Panic! Episodes Online

Sousuke Sagara, a seventeen year old military specialist working for the secret organization MITHRIL, has been assigned to protect the latest "Whispered" candidate Kaname Chidori. To complete this task Sousuke will have to deal with enemies from his past as well as the occasional panty thief. Unfortunately for Sousuke, the toughest part of his mission isn't only protecting Miss Chidori but also getting used to living an average High School students life, no easy task for someone raised on the battlefield.

Genre: Action, Mystery, Drama, Mecha, Romance, Sci-Fi
Episodes: 26
Type: TV Series
Age Rating:   Teen +13  

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RahXephon Episodes Online

In the year 2012 Japan was invaded by the Mu. Human-like beings from another dimension with blue blood.

In the year 2015 Tokyo is attacked by invaders, who are repelled by a humanoid weapon called a Dolem. During the chaos, Ayato Kamina meets Reika Mishima, a girl whom he had never met but had done a painting of the morning before.

During that same day, he is attacked by government officials but a woman named Haruka comes to his rescue, informing him that she was sent to get him by the Organization TERRA, and that Tokyo had been sealed in a time rift where time flows one third as fast as the outside world.

He flees from Haruka onto a train where he sees Reika once more. Arriving at the Room of Rah, he follows her to a tremendous egg where the Dolem RahXephon is hatched from, and upon her singing his mother appears atop the Dolem that had stopped the TERRA Invasion. In the battle Ayato's mother is injured, and Ayato flees Tokyo Jupiter with Haruka upon seeing his mother's blue blood.

Genre: Adventure, Fantasy, Mecha, Romance, Shoujo
Episodes: 26
Type: TV Series
Age Rating:   Teen +13  

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English: Vision of Escaflowne
Synonyms:  Vision of Escaflowne,Tenkuu no Escaflowne

Vision of Escaflowne Episodes Online

High school student Hitomi is transported from Earth to the magical world of Gaea, where she meets boy prince Van Fanel, and is caught up in his quest to unite the countries of Gaea against the ominous Zaibach empire. On the way, she discovers an hidden ability and strives to unravel layers of mystery surrounding Van, his past, and the giant machine known as Escaflowne.