"The Holy Grail War...a ritual in which a number of magi summon the spirits of heroes past, to duel in combat for the ultimate prize - the Holy Grail. Possessing the power to grant one their greatest wishes, these magi would do anything to get their hands on it, whether that be murdering the other magi (a given), draining the local populace of their life force (somewhat common), or even breaking the rules set down by the arbiter of the war themselves (rules are more like guidelines anyways). Many have heard of it, though none have ever won - all competitors have either ended up dead, or fled the war before its conclusion, or found themselves tricked by some malicious entity. This time, though, the war will be different. This time, the war is..."
You lean back in your chair, stretching your arms above your heads, working out the kinks in your back and shoulders. You've been thinking about doing this for a while, first as a whim and then as an actual plan. It helps that you're unemployed, single, friendless, and not particularly busy - lots of time to write, and the more you write the less you think of how you should be doing something else with your life. In any case, you thought you'd try your hand at a perennial classic - the Grail War roleplaying game. Many have tried to run one, but none have succeeded. Most die during night one, but even those that manage to struggle past the inevitable "fluff roleplay for three weeks" phase end up dying eventually, for a myriad of reasons. This one, though, you have a good feeling about. After all, it's you writing it!
You start typing away, filling out the intro. It's important in these games to have a good hook - if people wanted to play the basic fate stay night setup, they'd just watch the anime - at least that ends. Besides, it takes a level of prewriting that you just can't expect from random forum posters on a sci-fi nerd discussion board. No, you've gotta do something to surprise people! You gotta make it COOL and INTERESTING. You start writing down ideas for the concept, haphazardly listing them out on an unnamed google doc. It's going to be hard to find later like this, you think, so you rename it to "COOL FATE GAME". The all-caps will make it easier to find in the dustbin of your other concepts, like "mass effect but jurassic park tho", "mafia 29: this time the GM is a player", "D&D game", or that one document that you just titled with a punch of emojis. You're pretty sure the eggplant means it was erotic fiction, but you can't recall ever writing anything even remotely close to that. You haven't looked, just in case the Trump administration is monitoring your internet traffic after that time you said you wanted someone to steal his hair with a drone.
When you finally catch your train of thought and get back on track, the sun is setting and you've got about a hundred and fifty words down on the document. But that's ok! You've written thousands of words in mere hours before, you won't let this discouragement get to you. You open twelve tabs of the Type Moon wiki and get back into the swing of things. Before you know it, you've got everything you really need written down, and all you need is the twist! You look back at the google document, ignoring the fact that your opening minus the twist is still sub-1K words, and think. What do you want this game to be set in? There's a lot of options, Type Moon's a big place.
Your RP will be set in:
[ ] Fate/Stay Night style: Modern Japan! You can't literally JUST do Fate/Stay Night, of course, but who doesn't love Japan? No one, that's who. Players will fight in the city of Fuyuki, probably killing a shitton of people in their fight for the Holy Grail.
-[ ] Let's get gimmicky!: Every Servant summoned must meet a certain gimmick. Watch your players dance as they try to make a Servant they like that also fulfills your fetishes!
[ ] Fate/Apocrypha style: Not exactly World War 2, but you can see it from here. Nazis stole the Grail during the second War to End All Wars, and now your players will kill each other in a display of violence Eastern Europe hasn't seen in...at least two years? Plus, there's two teams, so in theory people can cooperate instead of just trying to kill each other all the time forever.
[ ] Fate/Extra style: Servants on the MOOOOOON! To be honest, you really liked Fate/Extra, because of how stripped down the concept was. There was that sequel game, and then the other sequel game, and then the sequel anime, but all those failed to capture the true appeal of the original - one on one matches in an incredibly organized fashion. You figure it'll probably be a little easier to run with that setup anyways.
[ ] Fate/Grand Order style: You can't actually write this one for very long, but if you compress the story and rip off the japanese stuff no one has read yet, it might work? Plus you don't have to have players fight each other and you can just do whatever you want.
[ ] Fate Prisma Illya style: Play as prepubescent girls in skimpy outfits, who constantly fuck! Also, there's like, cards and wands? You can't actually do this one, one of your friends is a moderator and told you that it'd get shut down, and possibly reported to the FBI.
[ ] Original style: You made your own, original gimmick! Aren't you clever? Yes you are! Too bad you won't get nearly as much engagement, since you've never been able to effectively convey how cool your ideas are to everyone else.
-[ ] Cards: It's like Prisma Ilya, but without the child porn! To be honest, you just really like Cardcaptor Sakura's theme song.
-[ ] Elsewhere in the Nasuverse: You don't actually know how Nasuverse works, but there's like, aliens on mars and venus right? Maybe they're the big bad!
-[ ] An actual no shit completely original idea: Haha, yeah right. It's just homestuck with all the names filed off.