If you're looking for anime similar to Heavy Metal Warrior Xenon, you might like these titles.
Makenko used to be a normal boy -- until he was kidnapped by the brain monster Dr. Mud and transformed into a cyborg capable of destroying both the monster and human worlds! On his quest for vengeance, he is inadvertently joined by Makendo, a fellow monster hunter who would prefer not to be, and her little sister Hikari who would like nothing better! Dastardly demons and wacky monsters abound as the trio fight the bad guys to kick some monster butt, and get Makenko's body back!
Born of legendary origins, the young Madara has grown up in obscurity as an apprentice blacksmith. An encounter with the demonic Mouki reveals his destiny, and catapults him into the middle of a mystic quest. Madara fights for revenge with the help of freedom fighters, magical swords and Kirin, the master of the Majin. His goal is to defeat his brother and then overthrow his father, the despotic Miroku.
Ryo Takatsuki injured his right arm in an accident years ago. The resulting surgery brought about some unexpected, but not entirely unwelcome changes -- enhanced healing along with the presence of a superweapon dubbed "ARMS" in his body. But with all power comes a price, and with newfound allies who share his predicament, he must battle a secret organization trying to control the ARMS while trying to find the truth behind the weapon in his body for himself...
Meet the Keith series, the top brass of Egregori. They are five cloned siblings with terrifying powers who can only agree on one thing: the "Arms" must die!When they learn that the targets of their "hospitality" have come to America, a little welcome party is planned. Meanwhile a small town called Gallow's Bell turns out to be another top-secret Egregori breeding ground. Not only is it the home of the super-enhanced, cyborg solider "Hound Battalion," but it also harbors the Chapel Children! Could this be the Arms' own OK Corral?
Shimamura Joe is a race car driver who is captured by the Black Ghost organization after an accident during a competition. Transformed into a cyborg with enhanced abilities, he and other bionic prisoners must escape the clutches of the evil corporation who wants to use them as instruments of war.
When Nanakorobi Nene, a cybernetically-enhanced girl-next-door, heads to the island metropolis of Cenancle to live with her aunt, she has no way of knowing what's in store for her. A chance meeting intertwines her fate with that of the super-rich inventor, Uzal Delilah, and her adorable and grumpy companion, Clarion, who happens to be a cyborg just like Nene. Nene is thrilled to make a friend, but there's more to Uzal and Clarion - and the island of Cenancle itself - than meets the eye. When a super-powered terrorist threatens Cenancle, Uzal claims that the only way to avert disaster is for Nene to team up with Clarion and use their combined powers - abilities Nene never even knew she had!
In the year 1580, Nobunaga Oda is on a warpath to obtain rulership of Japan at any cost, and ninja and samurai alike are banding together to try to put a stop to his tirade. But when the invincible warrior Ginnai Doma – also known as the Ninja Killer – enters the picture, more than just a little blood will be shed. It's up to Shishimaru of the Iga Ninja and other powerful fighters to take down Ginnai once and for all, but little do they know that aliens, cyborgs, and even strange technology are somehow involved!