Being in the workforce for a while shows that you deal with a lot of different people with different personalities. This shows that we have to be ready to handle any situation with anyone. We may not be equipped to dealing with certain people, so I would remain calm because not all coworkers are easy to deal with.
Not all coworkers are great, but most of them are decent when others are not. These are coming from my experiences, but not all people will encounter these types.
1. Your Work Wife/Husband
These coworkers are the ones that remind you to eat and drink water when you don't remember yourself. I've experienced those who will remember that you have to take medication at certain times at work or at home. They'll text you reminders in case you forgot something. This is sometimes a strictly platonic relationship but sometimes will develop into something more. These are the people that you keep close. Keep it professional at work though!
2. Your Work Best Friend
This is similar to your work spouse, but they are different in many ways. This co-worker is the person you hang out with after work, and days off. This person will invade your personal space, but 99.8% of the time you do not care.
This person will care more about your mental health, and personal life outside of normal habits. This person will come to your house after the big fight with a coworker or even the boss. This person will sit with you and bad mouth people, and you know this person WILL NEVER SAY ANYTHING OUTSIDE OF THAT CONVERSATION.
3. Your Work Two-Face
No not the Batman villain, but pretty close. This is the coworker that will sit near you hoping to catch something that would make great gossip. They tend to make themselves at home at the desk of those who are above you in station. It's shown when they twist the truth and end up having someone called to the office in the end.
They often hold a position that's slightly higher then yours or they could be your equal. They'll smile and act like they have your best interests at heart; for instance they might straighten your shirt if it is not in proper place. They also could sit at the desk of your higher up, and act like they are there for support.
They are always on the look out for information that would be valuable for them to either move up or to destroy the reputation of those they dislike. When they feel like they can get away with it, they will These are those that one has to look out for.