Here is the current list of NPC/Helpers of the game so far. It doesn’t includes cameos, like Moon Dragon or Miss Marvel.

27 characters so far. Andromeda, Ant-Man, Arachne, Aurora, Beast Bot, Black Knight, Captain America, Deathlok, Dr. Strange, Emma Frost, Firestar, Firebird, Hawkeye, Iceman, Jean Grey, Jack of Hearts, Luke Cage, Mockingbird, Northstar, Psylocke, Scarlet Witch, She-Hulk, Storm, Thor, Wiccan, Wonderman and Yellow Jacket.
This number will be bigger for the next release and I don’t have idea of how big this number will be on the final release of the game, but you can think about something close to 60+.

Also, I will try to record a video with Hercules on the weekend.