Some more tag suggestions. [@Ellri][@Mahz]

[b]Deadly[/b]-[i]There is a high chance of your character dying.[/i]
This would be for RPs where, as the tag says, your character is likely to die.

[b]PvP[/b]- [i]Players don't need permission to injure or kill player characters. Just in-game logic.[/i]
Again, as the tag says. If my character wants to stab yours with a sword, or poison to kill, I don't need to ask anyone. However it must make sense for your character to do so, and for the means by which it is done. 

[b]Waves[/b]- [i]Players may join or remake characters at specific times.[/i]
Instead of having only "Open" or "Closed", this means that the host will accept applications and start characters at specific times throughout the RP.