If you're looking for anime similar to Mobile Suit Gundam SEED C.E.73: Stargazer, you might like these titles.
In times of olde, humans live in constant fear of demons known as yoma. These vicious creatures can take the appearance and memories of humans they have devoured, thus blending into society as they freely feast on human flesh. The key to stopping the yoma lies with the tolerated yet feared Claymores - women who are half-demon, half-human, and fully fated to become the demons that they hunt. Meanwhile, in a village, the young Raki has been banished; his only crime was losing his family to the yoma. Raki is drawn to a Claymore named Clare, and together their journey begins. While Clare fights the yoma plaguing the land, can Raki help her in her struggle to retain her humanity?
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Both main characters are similar (Clare and Sven) as they became soldiers since childhood and went through inspiration and tragic pasts (the deaths of their parents) in different ways (Clare-Teresa and Sven-Science) and are part of the organization whose goal is to extinct races (Organization with Half Human Half Yoma against Yomas/Awakened Beings and Earth Alliance/BlueCosmos/Logos/Phantom Pain with Naturals and Extended/Biological CPUs against Plant/Zaft/Coordinators) and both would later betray them at the end. Sometime during the story, they form bonds with other beings (Clare-Raki and Sven-Selene) whom will change them forever. Both shows contain dark, suspense, seriousness, gore, and sword fighting. The only difference is that in Claymore, it involves demons, powers, and ancient weapons whereas Gundam Seed CE 73 Stargazer involves Mechas, space, ships, guns, and other mecha melee weapons and with no powers.
The year is UC 0123, and humanity is spread out across several colonies and the earth. An age of peace is shattered as the Crossbone Vanguard stage an assault on the station Frontier IV - their goal is to create a new age of aristocracy called Cosmo Babylonia; their method is destroying the federation and part of the populace. Seabrook Arno, a resident of Frontier IV, finds himself forced into the resistance in order to protect his friends. Piloting the new Gundam F91 model, Seabrook must now fight against the Crossbone Vanguard, as well as his childhood friend Cecily Fairchild.
It has been three years since Principality of Zeon's defeat in the One Year War. The colonies are slowly being rebuilt, and life continues forward – at least for most. Remnants of Zion’s forces, the Delaz Fleet, have not given up. After biding their time, they launch their 'Operation Stardust' by stealing the GP02, a nuclear-armed Gundam Unit. A small group of Federation forces are tasked with trying to regain the GP02; but even equipped with the GP01, can they stop these Zionist troops before Operation Stardust reaches completion?
The tragic story of Char Aznable, the ace pilot known as the Red Comet, and his sister Sayla Mass unfolds against the backdrop of the events leading to the One Year War. The Zabi family's rise to power, the birth of the Principality of Zeon, the early days of famous aces such as Ramba Ral and the Black Tri-Stars, the development of the revolutionary new weapon known as the mobile suit, and the road to war against the Earth Federation are all depicted onscreen for the first time.
Beginning four years after the one year war, 0083 starts with the arrival of two new Gundam units to be used for gravity testing. Things take a turn for the worse when members of Zeon steal Unit 2 and the nuclear warhead it that it has been armed with. Young test pilot-in-training Kou Uraki, piloting Gundam Unit 1, must now capture the stolen Gundam before it can be used to fulfill Zeon's mysterious "Operation Stardust".