If you're looking for anime similar to Zoids: Guardian Force, you might like these titles.
Gene Starwind and Jim Hawking make a living on various jobs and bounties. While waiting for their ticket to hit it big time, a mysterious woman named Hilda leaves them with a key to the puzzle of finding a starship of great power, known only as the Outlaw Star. What are these long lost spaceships and what is the Galactic Leyline?
after going back and refreshing about the characters in these series, it's obvious many are mirror images of each other. in regards to character templates. without giving away spoilers, both anime have the amnesia and "choosen one" complexes, lone wolf characters, "Muscle of the group", and entrepreneurship. plus the main characters both have tragic losses in their respective families. many more similarities...
Jumping from world to world, universe to universe, Yoko, Simon, Kamina and the gang find themselves in various new roles. From a moe magical girl’s average day at school to various giant monsters battling under control of their masters, it seems a quiet moment cannot be found anywhere! As if this wasn’t enough, an epic battle of man against beast-man can only end with one victor whilst Darry and Gimmy explore an alternate vessel with a storybook surprise behind every door.
Many years ago, Duke Fleed fled to Earth with the mighty Grandizer robot to prevent it from falling into the hands of the Vegan Empire. Hiding the robot and taking on an Earthian persona, he vowed never to pilot Grandizer again. Fast forward to the present, and a group of UFOs led by his childhood sweetheart have tracked down Duke Fleed once more. Demanding Fleed turn himself over, they give him a choice: return the Grandizer or watch Earth be destroyed! Will Duke Fleed stand by and watch his adopted home be obliterated, or will he break his vow, pilot Grandizer, and face off against the combined Vegan UFO Fleet?
Mars is discovered on a forming volcano island, Heisei; a man with no memory. In reality, Mars is from outer space, and is supposed to gather information to decide whether Earth should be destroyed or not. Along with the giant robot Gaia, and his mysterious images of a woman urging him not to destroy the world, Mars decides to fight for Earth rather than destroy it, even if it means fighting his own kind. But if Mars is killed, Gaia will explode, destroying Earth along with it.