All of those things except the triwizard tournament, because the RPG is set after Voldemort is defeated.
I suppose now I have to explain...
The plot:
Immediately after the defeat of Voldemort, when Kingsley is meant to be becoming Ministor for Magic, Kingsley is murdered by someone. 2 groups of politicians of the Wizengamot start pointing the finger at each other, and naturally the two sides start trying to prove to the wizard community that they are the side to choose.
You must help one side in the struggle for control during your time on this server but after every round of battles there is a time for rest and recovery (enough for even people transfigured into frogs to get back onto their human feet)
House Elves:
When you are injured, jinxed, transfigured or tortured, if you possess a house elf, recovery will become much faster. House elves are limited to one per person. House elves do other things that you tell them to, such as send messages (although owls do it much faster), hunt people down and bring them to you, clean rubbish up, yell their loyalty to anyone who will listen and even charge into battle at your side.
Dementors: Whoever wins control of Azkaban has control of these foul beasts. Each member of the team that owns it can have two dementors at their will (already you can imagine how hard people will be duelling for control of Azkaban.)
Dementors can take the players' soul. When this happens the player turns into a dementor, but still having the human will to fight for their soul, naturally they can still fight amoungst their friends. Players can regain a soul by finding 2 horcruxes. Horcruzes are very hard to get to (think challenges) and even when you do, you might not realise that it is a horcrux.
Other creatures will include, but are not limited to: Inferi, Werewolves, Sphinxes, Dragons (dont expect this too soon though), Merpeople, Knarls, Pixies, Boggarts, Blast Ended Skrewts and Giants.
My brain has tackled every question anyone can throw at me >:)
Poll