Douche

Douche is the main antagonist of the 2016 movie Sausage Party. He is voiced by Nick Kroll.

In the film
Douche first appears getting purchased by a woman. Once he is placed in her cart, he starts acting like his namesake (IE, a "douche" who is an extremely unpleasant person to be around). He is clearly happy to be on his way to the Great Beyond (what the food believes lies outside of the market). He was seen bullying a bag of potatoe chips, telling him that he should go to the gym and lose weight.

When Honey Mustard (who was returned to the store) tries to tell everyone in the cart that they are all doomed, no one listens except a sausage named Frank. Deciding everything is pointless, Honey Mustard jumps from the cart, committing suicide. Frank tries to stop him, resulting in a few of the items, including Douche, falling out of the cart. This results in Douche's handle getting bent.

After the woman salvages what she can and leaves, Douche discovers his handle was damaged in the fall. He then notices Frank and Brenda and blames then for his predicament. Before he can attack them, however, he is swept up by Darren and thrown away.

Near death and new plan
Escaping from the trash, Douche crawls around the garbage room, during which he discovers he has a leak and his fluids have drained. Distraught that he can never be used, he then hears someone calling for help. He crawls up some stairs and finds a torn juice box.

Getting an idea, he sucks the juice out of the box (in a scene parodying oral sex, as the tear was on the juice box's "crotch"), healing himself and fixing his handle, and well as giving his thin arms muscles. He then tears the juice box apart and takes the label off, using it to cover his tear. He then sets off in search of Frank and Brenda, intent on getting revenge.

Hunting Frank and Brenda
Offscreen, he goes around telling (likely threatening) various food items that he is hunting a sausage and a bun, and for them to tell him if the two are found.

Final battle
During the final battle, he teams up with an unwilling Darren, where he "Ratatouilles" him by yanking on his testicles.