Since Halloween is coming up, how about some supernatural or occult themed trash? Hydra seems to operate on principles that are part science and part occult, so there are tons of fun possibilities. :-D I don't have anything specific in mind, but here are some suggestions:
The Winter Soldier is used to feed a supernatural creature Hydra has captured because his enhancements allow him to survive the feedings. Perhaps the control Hydra exerts over the Winter Soldier can be extended to the supernatural creature as well through this feeding mechanism?
The Winter Soldier has to drink blood (or other bodily fluids) to maintain his enhancements, and part of induction into Hydra is having to feed the Winter Soldier (and maybe the new recruit has to receive the same from the Winter Soldier).
The Black Widow moniker is quite literal, in that they feed on their victims, so post-Red-Room Natasha needs either a steady supply of victims (if such feeding is always fatal) or a willing donor (or donors) to keep her from breaking down.
The Winter Soldier is a demon allied with Hydra that is possessing Bucky's body, so Bucky can see/hear/remember everything that happens to him, but is powerless to stop it from happening.
Making the Scarlet Witch and Quicksilver from Wanda and Pietro Maximoff involved summoning one or more demons to rape them.
Supernatural/Occult Trash
The Winter Soldier is used to feed a supernatural creature Hydra has captured because his enhancements allow him to survive the feedings. Perhaps the control Hydra exerts over the Winter Soldier can be extended to the supernatural creature as well through this feeding mechanism?
The Winter Soldier has to drink blood (or other bodily fluids) to maintain his enhancements, and part of induction into Hydra is having to feed the Winter Soldier (and maybe the new recruit has to receive the same from the Winter Soldier).
The Black Widow moniker is quite literal, in that they feed on their victims, so post-Red-Room Natasha needs either a steady supply of victims (if such feeding is always fatal) or a willing donor (or donors) to keep her from breaking down.
The Winter Soldier is a demon allied with Hydra that is possessing Bucky's body, so Bucky can see/hear/remember everything that happens to him, but is powerless to stop it from happening.
Making the Scarlet Witch and Quicksilver from Wanda and Pietro Maximoff involved summoning one or more demons to rape them.