Really inconsiderate flatmate....

lol, you don't want to annoy him?!

I never had this problem in my 1st year but if i did then i'd definitely do something about it. You say he's scary but i doubt very much he'd ever do anything suspect towards you, if he did report him again.

they pulled the fire extinguisher off the wall the other night, they pulled the lock off someone's food cupboard the other week, they keep trying to get into my room

Obviously try to talk to him first; but that fairly clearly isnt going to do anything. Speak to your resident tutor and tell them what theyve done, they'll be very interested in the fire extinguisher bit, thats automatic expulsion in most universitys.

Report him NOW and also to the university if your accommodation is affiliated with the uni in some way - this will fall under harrassment / bullying and he should get a warning that he will be kicked out of uni as well as his accommodation.

In my first year my life was a misery due to the inconsiderate, selfish people I lived with - 3 of us lived in misery while the other 5 (1 of whom didn't even live there, he moved in unofficially from another flat to live with his disgusting girlfriend) carried on regardless.
They never cleaned, tidied, took the rubbish down (ok, annoying and lazy but not the end of the world) but went out every single night and deliberately woke us up and then kept us awake, usually between 3am-5.30am every single night. EVERY NIGHT. They brought people back to the flat every night, were taking drugs, sh*gging on the kitchen table, (no I never ate at that table again, there is not enough bleach in the world) took clothes from my flatmates' room and denied it, (we quickly learnt to lock doors) had regular screaming matches between themselves and other people that had come back with them, and ate every bit of food we bought. It was constant and unrelenting.
I had a heavy course workload even in the first year, and came out of the first year depressed, sleep deprived and with a 2:2, hating uni and feeling cheated out of enjoying my first year at uni.

We tried hinting, talking, notes, begging, reporting to security, reporting to the accommodation supervisors, accommodation managers, we had big mediation meetings, they were threatened, but ultimately until they were told that if we chose to complain to the uni and they could easily be kicked out for harrassment, it didnt make one iota of difference. It quietened down slightly about a month before the end of term on the strength of this threat, and we existed barely communicating in a tension-filled hell hole.

Needless to say we don't speak anymore. (although myself and the nice 2 have an unbreakable bond resulting from what we endured, so every cloud and all that...!!)

Sorry to rant , just really empathise with you!!
Moral of the Story - be strong and take action NOW. It's only November, you have another seven months to get through.

That was pretty bad.

I also have a noisy person on my corridor who leaves his door open and plays loud music all the time, although earplugs work wonders . He also propps open the main door onto the corridor with a fire extinguisher so that poeple from other coridors can get in. (is that classed as tampering with fire equuipment as he is using a fire extinguisher to keep the main door open, which itself is a fire door?). He should just let peiople in anyway, seen as he live next to the door.

I can't believe your house managers let people get away with stuff like the examples above! Ours is a little dragony but she would not stand for any of it, tampered with fire extiguishers are a £100 fine, loud noise after 11 and there would be trouble. I can picture my house manager kicking any of those idiots out. So be brave and report them! It's not acceptable.

You could never get away with drugs here ellewoods, I think the cleaners have a quick snoop around every morning just to check. Plus we have a room inspection this week, they search under the sink and stuff apparently (that's where drugs have been hidden before I think.)