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Bedmate Reveal: Blueblood waking up next to Rarity demonstrates that the time loop is finally over.
Be Yourself: In order to finally escape the time loop, Prince Blueblood must arrange for everyone to enjoy themselves at the Gala without violating their central character traits or causing a disaster.
Black Magic: Blueblood dabbles with this during the time loops in a desperate attempt to escape. The spell consumes the user's soul, and covers the entire castle grounds in unquenchable hellfire. Blueblood dies thinking he'll finally escape. Nope.
Despair Event Horizon: As with the movie, after Blueblood discovers he can't kill himself to get out of the loop, no matter how thorough. Unlike the movie, he has a second, Played for Drama one later on when he makes the Gala perfect for everypony…except himself, meaning the loop repeats. He seriously considers making a Deal with Discord after that.
Driven to Suicide: Blueblood. Killing himself only makes the loop start over quicker, though.
In-universe, the real-life song Equestria Girls. It's Blueblood's alarm clock tune and signals the start of a new loop. He occasionally hums it.
Also in-universe, The mane six's "At The Gala" musical number. Having to listen to it every loop just about drives Blueblood to madness.
Fate Worse Than Death: Blueblood considers the time loop this for quite a while, and in fact spends a drastic number of loops killing himself by every way he can imagine. It's only when he discovers that even a Black Magic spell that should leave him Deader Than Dead won't work that he gives up on killing himself and instead focuses on finding what condition will break the loop.
Played with a little bit: in each loop, everything is the same to the smallest detail, except for Pinkie Pie's reaction to any given event, which is different every time. Blueblood is very surprised at this; Pinkie is not.
Laughing Mad: Manifests itself when Blueblood is driven to suicide in the most drastic fashion he can think of. Also a comedic example when Blueblood wakes up in one loop after learning about all the different kinds of apple desserts from Applejack. This leads to him smashing his alarm clock and making his way down stairs, cackling maniacally as he goes to the kitchens to add them to the Gala's menu.
The Many Deaths Of Me: In one later chapter, Blueblood openly admits to having killed himself by every imaginable means he could think of in hopes of escaping the time loop through death.
Mundane Utility: Blueblood learns how to teleport. He uses it for things like catching a falling vase.
Pity the Kidnapper: The guard Blueblood assigns to monitor a seemingly random area soon stumbles upon Trixie being harassed by some Diamond Dogs…or was it some Diamond Dogs being harassed by Trixie?
Powered by a Forsaken Child: During one of the loops, when Blueblood goes crazy and burns down Canterlot, he uses a spell to create fire that burns for eleven days and eleven nights, can't be extinguished by water nor wind nor mortal magic...and all it required as a reagent was the body and soul of a single pony.
Suicidal Cosmic Temper Tantrum: The most drastic loop of the "Blueblood attempts suicide" phase of the fanfic; Blueblood uses Black Magic to cast a spell that consumes the caster's soul, which he hopes will render him Deader Than Dead, and uses the resultant magical fire to burn Canterlot and everypony in it to the ground.
What You Are in the Dark: After his failed attempt to get everyone to enjoy the Gala, Blueblood is driven to seeing Discord and freeing him to find a way to break free. In the end, he decides not and plods back for another attempt.
Who Wants to Live Forever?: Theoretically, should Blueblood desire to do so, he could stay, eternally youthful, within the "Groundhog Day" Loop forever. He instead tries his hardest to get out. After hundreds of repeats, he eventually does.