"Sikh" is a custom champion in the League of Legends. He is a life trader assassin that kills a certain target in exchange for gold and Rare/Legend Items which a contractor must acquire for trade. His appearance is different from the other goblin, his complexion is dark green, he uses Majeda Twin Knife that changes its color in Red and Blue, and a dark lurker where he can travel through shadow to assassinate targets. He lives in the Bilgewater; if you want to trade, be ready for it's trade quest because if you fail, you will be the target.
Majeda twin knife is his favourite weapon, a legendary and one of the rarest weapon in Valoran, said it can cut through flesh as well as energy that flows freely to the body. Also known as the Perfect Assassination Tool.