In J. K. Rowling's “Harry Potter” series, Dementors are evil creatures that suck people's souls out of their bodies, leaving them merely as shells of humans. Whenever a Dementor enters the room, it goes dark, people get cold, and they begin to recall their worst memories. Rowling said that she developed the concept for Dementors based on highly negative people ― the kind of people who have the ability to walk into a room and instantly suck the life out of it. Dementors suck the life out of the room by imposing their negativity and pessimism upon everyone they encounter. Their viewpoints are always glass half empty, and they can inject fear and concern into even the most benign situations. A Notre Dame University study found that students assigned to roommates who thought negatively were far more likely to develop negative thinking and even depression themselves.
Manipulators suck time and energy out of your life under the façade of friendship. They can be tricky to deal with because they treat you like a friend. They know what you like, what makes you happy, and what you think is funny, but the difference is that they use this information as part of a hidden agenda. Manipulators always want something from you, and if you look back on your relationships with them, it's all take, take, take, with little or no giving. They'll do anything to win you over just so they can work you over.
To envious people, the grass is always greener somewhere else. Even when something great happens to envious people, they don't derive any satisfaction from it. This is because they measure their fortune against the world's when they should be deriving their satisfaction from within. And let's face it, there's always someone out there who's doing better if you look hard enough. Spending too much time around envious people is dangerous because they teach you to trivialize your own accomplishments.
Self-absorbed people bring you down through the impassionate distance they maintain from other people. You can usually tell when you're hanging around self-absorbed people because you start to feel completely alone. This happens because as far as they're concerned, there's no point in having a real connection between them and anyone else. You're merely a tool used to build their self-esteem.
Victims are tough to identify because you initially empathize with their problems. But as time passes, you begin to realize that their “time of need” is all the time. Victims actively push away any personal responsibility by making every speed bump they encounter into an uncrossable mountain. They don't see tough times as opportunities to learn and grow from ; instead, they see them as an out. There’s an old saying : “Pain is inevitable but suffering is optional.” It perfectly captures the toxicity of the victim, who chooses to suffer every time.