One of Zumina's abilities is the creation of "Golems", Large drones created from liquid Mass and, often times, rock. Typically not capable of their own thought, they are still effective as additional muscle, as seen with the takeover of Black Maw.

Sinaga is one of these Golems, but a special one. Effectively Zumina's shadow, and created with some influence from Skubasti, Sinaga was sapient, able to act on his own. However, his one goal is to serve Zumina, and cares for little else. While stone was not incorporated into him, he is fairly versatile and agile compared to other Golems.

There isn't much he does on his own, as he is very much an extension of Zumina, character-wise. He does like eating out to try different cuisines, though.