Change the locks. Call your parents. Last resort you can call the cops.

How do you suppose to squeeze cash out of a freeloader like him? Getting people who don't want to to pay rent isn't easy.

Dude, he just won't do it.

They are in New Zealand thats near Australia.

Site wasn't displaying that, but I would imagine that New Zealand has similar laws. In fact, most countries would have similar laws, as long as said country acknowledges the legal concept of private property.

It doesn't actually state of the brother is younger than OP. As someone who had to literally stab their older sibling to make them stop behaviors similar to OP's brother, I'm more inclined to think he's older than OP.

You literally stabbed your brother? Not judging, but I am incredibly curious about that situation.

To keep it short, I found him in my room without permission, and going through my stuff on top of that. I tried to move him away from the dresser, so he grabbed me by the collar of my shirt to try to throw me across the room, causing the collar to choke me. Needless to say, I panicked and stabbed him in the arm with a mechanical pencil I was holding to make him let go. Several times. He got stab wounds, I got a very bruised throat, and he never went in my room again.

You didn't want him to find your super rare Pokemans. (I assume you were kids)

That depends on whether you count 13 and 15 as kids. While I am generally very touchy about people messing with my stuff, my reaction was more over the fact he was diggin around looking for the- at the time- $150 dollars I had saved from birthday and holiday money, plus saving change. We didn't get allowances, so that was the only money that we could 100% do whatever we wanted with, provided it wasn't illegal. He had (and still has) no grasp of financial management and wanted to buy a wrestling game or something, and him trying to steal from me probably exacerbated the situation. Our mother was pretty pissed about the whole thing and majorly got on his case about it. Made him stop stealing from me, but he just skimmed money from our mother's wallet. Wasn't the last altercation we got into that lead to relatively major injuries (he gave me a fractured rib on two separate occasions, I damn near broke his nose, and later nearly made him suffocate) but it being a small town at the time, there weren't any services to deal with him. Except forcibly admitting him to a psyche ward, but the entire family threatened to disown my mother and I if she did put him in one, despite the fact they knew he had injured us both on more than one occasion. Just to put on record in case there is anyone who would freak out over that- he's moved out now and I don't care about it anymore, and just limit interaction with him. TL;DR: My brother was a bit of an abusive asshole from age 12 to 22, and generally would up regretting any time he made it physical because I am good at coming up with improvised weapons.

"Prank" him? WTF?