Galen Marek (FORCE)

Galen Marek was a Human male taken as a secret apprentice by Darth Vader from his father, a Jedi named Kento Marek, on Kashyyyk during the Great Jedi Purge. For years, the Dark Lord trained him, under the codename Starkiller, in dark side arts and to eliminate his enemies, including Jedi who survived Order 66. In 3 BBY, he fell in love with Juno Eclipse, and spend much time when they were on missions. He is the father of Anakin Marek, who was given the name by his former master, after finding out about Vader's true identity.

Trained in the dark side
In Vader's custody, his memory was erased, and didn't know who he was, and how he was born. Vader gave him the name, Starkiller. Marek was taught the ways of the Force by the Dark Lord personally. Galen was first controlled by his fear, anger, and hatred. It never spreaded in him because Vader didn't guide him to the dark side of the force. Marek was taught how to control every force power that guides him to his destiny. Moreover, Marek's Master would never debate or enter into deep discussion with the him. His only inspiration was the thought of assisting his Master in overthrowing the latter's own Master, Darth Sidious, the Emperor of the Galactic Empire, as Vader had promised.

As Galen grew up on 3 BBY, Vader promised him greater power, and was taught to embrace his hate.

Eventually, Vader dispatched Starkiller on assassination missions against adversaries of both Vader and the Empire. Among the young man's targets were spies, thieves and high-ranking traitors to Imperial rule. To aid him in his task, Vader had provided Starkiller with two tools: a holodroid named PROXY, and a starship, the Rogue Shadow. The Dark Lord handpicked enlisted Imperials to pilot the Rogue Shadow, though he usually executed each of them within only a handful of missions.