If you're looking for manga similar to Vampire Wars, you might like these titles.
The story of a group of vampires who are being hunted down by the creations of Dr. Victor Frankenstein. The twist here is that the vampires want nothing more than to be left alone and do their best to not kill anyone... and Frankenstein's creations are all in the form of attractive psychogirls of varying ages.
The vampire princess Alice goes to the human world to find a groom in order to inherit the throne, and finds an unlucky man with a very powerful aura.
When forcibly injected with the DNA of Musashi—the legendary swordsman—by the secret organization Akai Umi (Red Sea), Hagane Yakushimaru becomes a master fencer with supernatural powers. She sets off to rescue her parents, who have been abducted by Akai Umi, making friends and foes with supernatural beings (parasite projects) who have also been injected with the DNA of other historical figures. What is Hagane's secret? Why is she the only successful female DNA injection recipient? What exactly is the project called the "Revelations of the New Millennium"?
Itagua and Kagua are two aliens whose spaceship broke down while they were visiting Earth, leaving them stranded and hiding in a dried water well. Due to the distance to their planet, they took 13 years to ask for help. And now finally...
Arika is what you could charitably call a vampire "enthusiast." When she stumbles across the beautiful and mysterious vampire Divo however, her excitement quickly turns to disappointment as she discovers he's not exactly like the seductive, manipulative villains in her stories. His looks win first place, but his head's a space case. Armed with her extensive knowledge of vampire lore, Arika downgrades Divo to a beta vampire and begins their long, long... long journey to educate him in the ways of the undead.
There's aliens about, lurking just outta plain sight. Most of them are regular folks, but some? Some are criminal. Enter Interstellar Immigration, Tokyo's finest cosmic border patrol team. They bust their asses on the daily to keep planet earth safe. Thus the spotlight falls upon the story of two high school girls, Lein and Ann, as they kick ass, hunt down illegal aliens, and look great doing it! Buckle up for bombastic sci-fi action with a twist!
Jiya is an alien and a galaxy patrol member on a mission to Earth. His first encounter with humankind is rescuing a rich party girl, Kaede, and her chauffeur Kyuumonji Yukio from mountain bandits. Using Kyuumonji's body as a host, Jiya is going to check out rumors of a recent infestation of "vampires" on Earth that are attacking beautiful young women.
Age of Scarlet Order, abbreviated as A.S.O., follows the continuing adventures of Mina Tepes, the revolutionary queen of the vampires. Along with her faithful werewolf bodyguard Akira, Mina will not rest until vampires and humans can coexist in peace–even when certain factions of the world want her dead.
This is a tale of modern-day magical ninjas. Reito is just an ordinary guy, who wants to maximize his own happiness by being cool and not thinking of others. However, his stupid, annoying, large-breasted neighbor Iona Shiragami keeps trying to be his friend. One day, he learns her secret: she's a ninja who guards a powerful family ninja art, and other ninja are here to take it from her. When Reito is killed in the crossfire, she uses her magical ninja art to bring him back. However, the art also turns him into a super powerful monster. Will he be able to turn back to how he was before, and what will become of his life now?