A more realistic list.
The Online Feminist
This person creates an account online with the only intention of attention seeking by posting inflammatory feminist threads. Every single thing relates to feminism - if someone got a 2:1 at university then its obviously because of them being marginalised and not having male privilege.
The Deluded Academic
This person is about 14-17 years old and is adamant that they are going to Cambridge or Oxford. Some of them do but the majority of them wake up to the real world and actually end up at another institution. At this point they then post all over TSR about how great this new institution is and how its better than Oxford of Cambridge, even though deep down they're insecure and gutted.
The Teen Know It All
This person is usually about 14-18 years old, has lived off the bank of mum and dad or state handouts, and yet seems to know absolutely everything about life and how it works, even with very limited experience. They appear to be overly reliant on the Internet for information and lack true real world experience. This is probably a symptom of not getting out enough and lacking the capacity to think for themselves.
The Radical
This person picks a topic, picks a side and their only goal is to completely push that agenda in whatever way they can. It doesn't matter if its religion, politics or any other issue. They will continue to push it and push it. Its often an extreme opinion that they'll continue peddling just to entice people in and get a reaction. In most cases this person doesn't even believe the line of argument that they're taking and are only doing it for the thrill.
The Statistician
This person won't believe anything unless you provide a swarm of academic sources, stats and arguments to back up your claim. Even then they will not accept your point of view because lets face it, your stats are nowhere near as correct or perfect as theirs. Do not even try to pass off a newspaper as a source or claim to have experienced in real life around this person because you will fall victim to a plethora of thread pages of complete nonsense.
To be continued.........