- Broken Base: In a variation of Old Guard Versus New Blood, ever since the release of Fate/stay night, the fanbase has been increasingly fractured between people who got into the Nasuverse through Tsukihime and earlier works and people who got in through Fate, thanks to the latter's popularity overshadowing the former's. note It got even worse when Fate/Zero and its massive popularity within the greater anime community got even more people into Fate, and what little unity remained was utterly pulverized thanks to the humongous success of Fate/Grand Order, which became the flagship title of the franchise.
- Complete Monster: Zouken Matou; Ryuunosuke Uryuu; Celenike Icecolle Yggdmillenia; Kiara Sessyoin; Manga Michael Roa Valdmjong ;Cornelius Alba. See those pages for details.
- Fridge Brilliance: The Mage Association is known for being made of up and encouraging the production of selfish Mad Scientists that will do anything For Science! if it means getting a step closer to reaching the Root and/or discovering the lost True Magics. So, is it any coincidence that the only modern-day beings who have managed to accomplish such tasks are Zelretch (who used Second Magic to save the Earth from Crimson Moon Brunestud at the cost of his strength being weakened, as well as essentially protecting the multiverse), Aoko (who gained Fifth Magic while trying to revive Soujuurou after Touko killed him to get to her and she also plans on finding a way to prevent the universe's heat death that she accelerated in the process), Mikiya (who accidentally reached the Root, but declined to know its secrets in favor of returning to his love, Shiki Ryougi), Shiki Ryougi (a warrior who fights demon and whose third personality is the Void itself), Justeaze (who used Third Magic for her friends at the cost of her own life), Illya (who used Third Magic from Justeaze to save Shirou's soul, also at the cost of her own life), and possibly Shirou (who may have gained a True Magic in order to reach the Reverse Side in his journey to reunite with Saber). The key to unlocking the secrets of magic and the universe is through selflessness.
- Memetic Mutation: See here for memes regarding the franchise
YMMV / Nasuverse