B'T X

Related anime: B'TX Neo (OAV) (sequel)
Genres: action, adventure, science fiction

Themes: mecha
Objectionable content: Mild (mild bad language and/or bloodless violence)

Synopsis: 

Teppei is going to visit his older brother Kotaro Takamiya during a scientific conference after training with a mysterious woman named Karen for the past 11 years. However his plans for a family reunion become stalled when a woman named Aramis kills everyone in the conference to kidnap Kotaro. Teppei on the way to save his brother encounters a broken mechanical horse called B't X who revives thanks to Teppei's blood and is now his aide to save his brother from the mysterious Machine Empire.

25 episodes:

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BLUE GENDER

Blue Gender

Alternative title:

ブルージェンダー (Japanese)

블루 젠더 (Korean)

Genres: adventure, drama, horror, romance, science fiction

Themes: alien, mecha, military, post-apocalyptic, real robot

Objectionable content: Intense (graphic depictions of sex, drug use, or bloodshed)

Synopsis:

Yuji Kaido was diagnosed with a serious disease and cryogenically frozen. He wakes up more than 20 years later--and Earth is nothing like what he remembers. A race of alien bugs called the Blue have taken over the planet, and a few select humans have retreated to the space station Second Earth. Yuji is taken back to Second Earth, where he learns that he and the other sleepers will be instrumental in defeating the Blue. And his relationship with one member of the recovery squad only serves to complicate things.

26 Episodes:

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BETTERMAN

Alternative title:

ベターマン (Japanese)

Genres: action, adventure, comedy, drama, horror, mystery, psychological, science fiction

Themes: mecha

Objectionable content: Significant (bloody violence and/or swearing and/or nudity)

Synopsis:

A deadly virus known as "Algernon" has attacked humanity with vicious meaning. At the forefront of the battle is the mystifying Akamatsu Industries – disguised as a heavy machine factory in Tokyo, this undercover organization uses neural enhanced weapons known as NeuroNoids to battle Algernon. Also helping with their secret efforts is the mysterious mutant who is only known as "Betterman".