The Sinister Six

In the Sinister Six, there are six members. Those being The Sentinel, The Warlock, The Harpy, YALUKE, The Cackler, and the other having yet to be found. All information we have is compiled below:

Watcher of Worlds
The Sentinel has one mission, and it is to watch over everything he sees. This makes him incredibly powerful because he studies all his foes in advance so that he knows how they fight and can counter it. It is unknown what his mission is on this planet but it cannot be good.