As a writer, I had an idea for a Live action Harlock script, and here's the breakdown/writeup

The plot would have elements of the original 1978 series, Endless Oddyssey and it's own unique plot.

Basically, the plot boils down to this:

40 years ago, the armies of Earth, Illumidas, Mazone, and the Machine Empire united to fight a common enemy, a dark army called "Acolythi"

10 Years ago, the war ended after two ships destroyed the flagship of the Converts. The Death Shadow, piloted by the young Captain Phantom F Harlock and the Queen Emeraldas, piloted by the eponymous Emeraldas . But, Harlock and his friends discover that the Acolythi's "master" is also behind the newfound alliance of these planets. The Alliance ambushed the crew of the Deathshadow, killing all of them, except for the mysterious Juran woman who sailed with Harlock, Miime. Including Harlock's best friend and Emeraldas' love, Toshiro "Tochiro" Oyama. Before his death, though, the genius engineer had created his Masterpiece of a ship, The Arcadia. Fitted with the best armor and weaponry in the Galaxy, decades, if not centuries. Harlock named this ship.....The Arcadia.

In the present Day, Tadashi Daiba is friends with Mayu Oyama (both are around the same age in this movie. Around 14-15). His father, a scientist working for the Alliance, discovers that the Acolythi have infiltrated the Alliance and are slowly building an armada to attack the Earth. They're seeking someone to fix the device to summon their master, damaged by the Assault ten years prior Dr. Daiba is assassinated by and Acolythi spy. Tadashi and Mayu discover Dr. Daiba, only to be cornered by the Acolythi assassin. They're saved by Harlock, who kills the Acolythi.

Harlock takes the two under his wing, and they try to stop the Acolythi.

Characters:

Captain Phantom F. Harlock: Captain of the Arcadia. Once an Ideal Ace in the Alliance, Harlock spent ten years as a renegade of the Alliance, picking up a crew of like minded individuals to help with the Arcadia. He sees a lot of himself in young Tadashi, and has taken to training him to be a honorable, True man. Harlock wields the deadly combination of the Cosmo Dragoon laser pistol and the powerful Gravity Saber, one of only a handful of masters of the laser rifle/Rapier sword combo. Lost his eye to an ambush from the Acolythi

Miime of Kassa: "The Woman who Gave Her Life to Harlock". Miime is one of the Last Jurans, a species with telepathic and telekinetic powers. After her life was saved by Harlock, Miime pledged her life to helping him. She serves as Harlock's advisor and the counselor of the Arcadia. She can use her telekinesis in battle, but as this drains her, sticks with a laser rifle or a combat saber.

Tadashi Daiba: The young man who once dreamed of being an Alliance hero, training in the use of weapons. Harlock unofficially takes him under his wing in the ways of honor and philosophy. He originally had a Cosmo Percussion blaster, but Mayu upgraded his weapon into the "Cosmo Corsair." One of only two in existence.

Mayu Oyama: The daughter of Emeraldas and Tochiro. She's as brilliant an inventor and technician as her father. Tadashi's her best friend. She sometimes remembers her father's death. She wields the other "Cosmo Corsair" and dreams of one day creating a ship that will surpass even the Arcadia, a ship strong enough to protect innocent life everywhere.

Kei Yuki: The Combat Specialist of the Arcadia. A strong willed woman who is training the two recruits in combat. The official strongest hand to hand fighter on the Arcadia, after Harlock.

Yatteran: The quirky pilot of the Arcadia. He's a bit of a nerd, obsessed with ships and historic battles, but don't let that fool you. Yatteran can fight with the best of them

Emeraldas: The widow of Tochiro, and one of Captain Harlock's best friends and his equal in battle. She flies the magnificent Queen Emeraldas spaceship. She is one of the few masters of the Gravity Saber, and lost her eye in a duel with the Acolythi General, Canaan.

President Quislig: The sleazy politician who currently represents Earth in the Alliance. He refuses to believe the Acolythi have returned, firmly believing everything's a "Pirate Trick"

Delucor: The schemer, the fallen, the darkness in all sentients life. He has many plans......and none of them are good for Harlock or the crew.

Geminus/ "Dark Harlock": The evil in Harlock's heart, created by Delucor to defeat Harlock himself.

Tochiro: Harlock's best friend. Emeraldas' love. The prodigy of Earth. The creator of DeathShadow and Arcadia The Fallen hero. But is he really dead? The crew of the Arcadia know he lives on in the ship, though the theories vary on how. Maybe he downloaded his brain patterns into the ship's AI? Maybe he put so much of himself into working on his masterpiece, it "inherited" his personality? Maybe his soul inhabits the ship itself? Only Harlock, Miime and Emeraldas know the truth.