Darth Caedus

A former Jedi and defender during the Yuuzhan Vong war, he worked to a position in the Galactic Alliance leadership during the civil war with Corellia. He was into accepting Sith Training by a woman known as Lumiya. Several Jedi died at his hand after he chose to use the Dark Side, and he also imitated the Empire’s earlier mass destruction by lighting Kashyyyk’s forests afire. He may have originally joined the dark side to protect his family but ultimately it lead to their betrayal.

Spoiler Content
]Caedus was born Jacen Solo, twin of Jaina and son of Han Solo and Princess Leia. During the Yuuzhan Vong war he was captured and tortured, but escaped. He helped win that war but moved closer and closer to the Dark Side until swayed by Lumiya, who had been trained by his grandfather, Anakin Skywaker, while he was still Darth Vader. Caedus was killed by his twin sister Jaina. At the last possible second, he sense terrible danger to the Hapan fleet in battle against him, and used the Force to send a warning to Tenel Ka, knowing that she and their daughter would otherwise be killed. Later, when Luke meets him as a spirit, Jacen claims to have seen his daughter at the side of a terrible evil and that his efforts were to prevent it.