If you're looking for anime similar to Blue Gender: The Warrior, you might like these titles. All recommendations are made by Anime-Planet users like you!
While the nations of the world are trying to abolish warfare and the existence of armies, private companies are creating their own armies. The Kuryu group has been trying to create the perfect weapon; human beings capable of mastering their "mind shadow" named Vajura. They were hoping for an edge, but the experiment seemingly went wrong. However many years later a strange young girl named Elaine escapes the Kuryu research facility. Confronted with hostile gangs, hunted by cybernetic agents, and other strange members of the Kuryu group she is forced to become the Genocyber, the first Vajura. Confronted again and again with the experiments of the Kyuryu group and the inhumanities of mankind, she has no choice but to continue to fight, but at what cost?
Even though Genocyber is much older, whilst watching Blue Gender: The Warrior I felt that they have a few similarities. Both involve monsters in a post-apocalytic world and there is plenty of gory violence. If you like that sort of thing try these animes out.