I'm not ready to start this thing quite yet, but if I get enough interest you can expect it to come out once I get more time on my hands. In the meantime you can come up with your own ideas on how to make this better and be ready when the time comes to start. This is a revamp of my previous idea that never got started, but I'm expanding on the idea and taking out unneeded stuff to hopefully make it better. So here it goes:
On a futuristic planet much like earth their most popular sport is by far the Blitz Arena. Although arena battles of old had a dark, grizzly past, with their highly advanced technology they've made it far more family friendly while still managing to keep the same intense action that they all know and love. They developed energy that can be emitted out of a device in a solid state, which can be formed into various weapons such as swords, bows, rifles, etc. Should someone get hit with what would be a killing blow, at worst the energy will knock them unconscious or otherwise safely incapacitated. If an attack would have chopped their arm off, instead it only numbs the nerves to that arm for the time being. You will experience pain, especially if you get hit multiple times, and getting hit too much (even if none of them are killing blows) will eventually knock you out, but at least you won't die. Guns, swords and any other weapon for that matter are balanced (at least in theory). If you have a machinegun, to counter it's rapid fire and long range you will have to hit them a whole lot to do the damage of a well placed sword stroke, and guns can't "cut off" limbs to numb them unless your "bullets" are so well placed that they'd go up in a line "cutting off" the entire limb. Staffs allows the person to cast magic, which is actually this very same energy. For example, energy that looks like fire will shoot out and hit your opponent, but will not send them to a horrible burning death. Many types of magic exist, and some can even mess up people's heads to create illusions. Don't worry. Magic is balanced with every weapon in that it takes more energy to use and requires casting/cool down times. The only way weapons are objectively better then one another is if you play in this roleplay a lot and earn more advanced levels. So that means a level 1 sword would be worse then a level 2 sword, but a level 1 sword is just as good as a level 1 rifle, just in different ways. You can have up to 3 weapons equipped in any battle so will have to strategize where to put your upgrade points. For example, you can have a staff, sword, and shield and put most of your upgrades into shield, having a near unbreakable shield but not so good attack power. We won't use actual stats, but the effects will be felt during battle.
People of all ages, genders, races, and backgrounds come to give this blitz arena a shot. The really good ones become world famous celebrities. Some do it on a professional level as their livelihood, although others are way more casual about it. The different races come from different evolutions on the planet rather then space aliens. There are lizard-like people that are tough and large but generally slow and not as bright, humans who are average, beast people (cat ears and tail, or other similar animals such as wolves) who are nimble but slightly weaker, and maybe a few others such as a really small race and a joke race where they aren't really talented but if you win you can rub it in people's faces. Heck. There might be level 0 joke weapons as well for the same effect.
There are team matches, free-for-all, one-versus-one, and even the occasional tournament (which can be in any of the three modes). You can form a team of up to 3 other fellow players or be a free agent. Whenever we wish to do a team battle, free agents who'd like to participate are randomly assigned to a team with empty spaces or an entirely new team of only free agents. We can have a full team vs. a full team, or maybe even selecting certain members of the team to participate in a certain matchups. This can have some strategy because if you're facing another team and separate into two different groups, you can divide your two groups to get a group A that you think will beat their group A (but you don't see who's in what group until the match starts, so you have to try and predict what they'll do, outsmarting them before the match even begins). Free-for-all matches can have any number of participants up to 4 and preferably all from different teams.
Touched upon earlier, you will earn points for various upgrades such as weapons or your overall tier level (max at around the abilities of a person who can beat up around 20 people and look awesome doing it). You get points for fair play, posting in a timely manner, participation, and of course winning, to name a few major examples. You can never lose points unless you go out of your way to be a jerk, unless there's a betting system that can be applied to any match where you loose whatever points you bet to the winner, but bets only take effect if all people agree on it.
Any questions? Ideas? Interest?