he has long hair and the planet he is on is futuristic and he becomes king or prince falls in love with a girl and he had to fight aliens in am arena

In a universe where human genetic material is the most precious commodity, an impoverished young Earth woman becomes the key to strategic maneuvers and internal strife within a powerful dynasty…

Talking Heads short discussing the creature design of splices from Jupiter Ascending.

A graceful prince of a far away planet is forced to abandon his reign in order to escape from the perfidious Nitron, "the vampire interplanetary" that means to conquer the universe. When damage forces the spaceship in which he is traveling to the Earth, a girl aboard his craft confronts two generous champions of freedom and autonomy, "Mysterious El" and "El Volador", who are Masked Wrestlers from Bolivia. They take great care that she is familiarized with the land habits of earthlings, including making love and drinking beer. The prince learns from his new friends all the secrets of a galaxy ring, which can destroy all evil as well as burn rocks. Fearing that they will be attacked by the enemy, the girl decides to hide herself behind the identity of the earth singer Larossa, who had died a year previous.

In the Andromeda galaxy there's a planet of a highly developed human civilisation. The gentle Prince Itaka and another kingdom's beautiful Princess Lilia are about to enter a love-marriage and take over the throne, when they discover a strange object on the nightsky. Later it lands on the planet, and an alien, mechanic civilization invades King Itaka's peaceful country making nearly everybody their slave. On a fateful night Queen Lilia gives birth to twins, and to avoid misfortune, the nanny Tarama takes one of the babies away, and entrusts it to the gladiator Balga. They still don't know, that the children were born with strong powers, and hold the key to the fight against the enemy that's searching to destroy every human civilisation on the planet... (from myanimelist)

In the latter half of 21st century, humans leave the Earth and begin to live in space. In order to adapt to the environment in space and deal with the hostile aliens in Jupiter, genetically engineered children called "Princes" are artificially raised and trained to be pilots of armed robots "AHSMB (Advanced High Standard Multipurpose Battle Device). This is a story about one of the teenage "Princes", Hitachi O Izuru, who studies in an academic city Grandzehle.

An intergalactic fighting competition between champions of various worlds has traditionally been won by a species much larger and stronger than humans. Entering the contest, a human finds he has to battle against not just his opponents and his self-doubts, but the corrupt system. Far in the future, on a distant space station, the legendary Arena is where the best fighters from every planet come to vie for the championship. But for over half a century, no Earthling has been good enough to be a contender. Until out of nowhere, comes an underdog: the great human hope, Steve Armstrong... and the best anyone's ever seen. He's been training all his life for a shot at the big time, but now he's up against some mighty big muscle: a ruthless extra-terrestrial crimelord who'll pull no punches to make sure he stops Steve dead. In the mood for hard-hitting sci-fi action? Arena will knock you out!

In a distant quadrant of outer space, there is a planet solely inhabited by men. They’ve been living under the rule of a virility dictatorship for many decades. In order to be labeled a man, one must wear leather, and grow a moustache. Anyone who doesn’t fit that archetype, or is simply hairless, is considered a slave. That is the case of our hero, Bang Bang, rightful heir to the throne, but cast aside for being hairless. He flees his planet and travels to Earth, where he crashes in the apartment of a porn star named Cathy. She’s the very first woman he ever saw, he immediately falls madly in love…

A young man travels to Mars in a rocket ship, where he leads a popular uprising against the ruling group with the support of Queen Aelita, who has fallen in love with him after watching him through a telescope.

In the midst of a violent invasion of Earth by unknown alien forces, photo-journalist Wakatsuki Tetsuya comes across a scantily-clad alien woman, cutting a swath of death through the Terran ranks with her sword. After a chaotic struggle, Tetsuya is knocked unconscious, only to awaken aboard her starship. To his surprise, she turns out to be Kahm, the invaders' princess - and she has picked Tetsuya for a starring role in her upcoming wedding. As the groom....