Evil aliens have decided to kill everyone on Earth! Fortunately, they've given you two minutes to save as many as you can. All you have to do is name a country to save everyone in it.
Use True Names for the Servants. Your confusing Sasaki with Hassan of the Cursed Arm, Hassan was "True" Assassin, Kirei Kotomine wasn't power hungry he just had a warped view of his religon. Medea was a witch not a wizard, It's Artoria Pendragon not Arturia Pendragon, EMIYA's weapons are anything but durable, Sakura was more specifically abandoned by her family, Shinji was never a master he was posing as one by "borrowing" Sakura's command spells and he has some magus abilities he just can't use them without his grimoire, Berserker wasn't based on Hercules that's just his Roman name, Illya wasn't a Teutonic aristocrat she was a homunculus, Lancer also battles with Shiro early on.