So this is Manthas, everyone! He's my Sith character based on Star Wars the Old Republic (game).
I just threw in the speeder and the citadel to give some kind of background, I did not draw them.

The hip cape will not be translucent when I make the costume for myself, but I thought it looked good here, so I went with it. I will later add a removable chest plate, a regular Sith cape, and skeletal robotic mask. Both to the costume, and to this drawing.

Manthas was born with a twin sister, but they were separated from birth. Manthas was given to/taken by a Hutt who named him Uzuri Vergas, meaning 'beautiful slave'. He grew up as a dancer for this Hutt, and his connection to the Force made him very desired. But when he was around 16, he was "rescued" by a psychotic Sith Lord called Darth Daken.
Uzuri renamed himself Manthas, meaning 'fear'. And since then, goes by that name only. Working as Daken's apprentice within the Sith Empire, Manthas met an Imperial agent who fell in love with him. Although his feelings for Manthas were not returned as Manthas had his eyes on a Zygerroan slaver calling herself 'Queen Roulette'. But because of her trade, her and Manthas never truly got along and it ended up in him killing her.
As the years went by, Manthas grew frustrated with his psychotic master, and the Sith empire in general. He faked his own death, with the help of the Imperial agent who still loved him, and turned to smuggling.
Here he met a new mentor. A Skakoan named Bult Muntor. Manthas lived as a smuggler for many years untill he was rediscovered by the Sith and executed for treason.