Star vs Hogwarts:
"Are you sure that's a real spell? Well, it's not very good is it?" Harry chuckled internally at his unawake friend's haughtiness, while contemplating what "real spell" he might dazzle her with, only for the visiting looper to beat him to the punch.
"Sounds like a perfectly good spell to me, you just need a little more enthusiasm!" Star Butterfly exclaimed, drawing out a "wand" that wouldn't look out of place in a muggle toy store. Hermione frowned, but before she could protest Star suddenly stood up, swooping her arms in an upward arc as she began to chant "Sunshine! Daisies! Butter Mellow!" she cheered, swaying her wand from side to side with the words, "Turn this stupid fat rat yellow!" she spun once and leveled her wand at the target like a hammer. In a flash of light and daisies, a slightly greasy "Scabbers" was in fact bright yellow. Hermione gaped, Ron grinned, and Harry just blinked.
"Wicked! How do you undo that, I want to try again!" Ron exclaimed excitedly. Harry snapped out of it and drew his own wand.
"Finite Icantatem" He intoned, curious as to how this might go. Ron stood up and imitated Star
"Sunshine! Daisies! Butter Mellow! Turn this stupid fat rat yellow!" Harry was prepared to suppress his laughter and console his friend on his inability to replicate out of loop magic, but when Ron's wand swung down there was a flash of daisies and the rat was once again yellow.
'So Star brought some of her worlds magic with her; this could be interesting' Harry thought.
...
"I'm sorry, it looks like your rat died of high cholesterol. I'd suggest you not feed any future pet so much butter."
'…yeah, Sirius will forgive me for not being able to exonerate him with proof of Pettigrew's survival, this is too damn funny.'
...
"Avada Kadavra!"
"Happy sunshine love explosion!" The battling death eaters immediately paused to stare as they tried to process what the Boy-who-lived said and the bright ray of light and hearts that battled with their master's killing curse... only to immediately regret it as they fell to various Karate techniques and flying narwhals from the combatants who where used to that brand of magic.
"How dare you insult me with this ridiculous display!" Voldemort snarled at Harry
"Yeah, it's kinda ridiculous... but I'm looking forward to the 'explosion' part." Harry grinned, and with a small push, a shining doe and stag split off the main beam and rushed toward the "dark lord" in a pincer maneuver. Voldemort was vaporized in the resulting heart shaped mushroom cloud.
Surprise!
"I don't want your wand. Destroy it." Toffee said as he shoved the plated wand back toward Star
"Whaaaaaat?" Star and Marco gaped.
"Surprise!" Toffee jeered with an all too familiar crazed grin.
"I can't. I don't even know how."
"Yes, you do. It's the first spell your mother taught you." Toffee spoke with a dissonant gentleness.
"The Whispering Spell" Star's eyes widened in realization
"Exactly. Marco's waiting."
"Star...?" Marco said uncertainly. Star knelt and picked up her wand gently.
"I'm sorry." As she whispered, the Wand's colors faded and it's wings crumbled away. Star shoved the wand back toward Toffee.
"Now let Marco go!" she said as she wiped away a tear. Toffee calmly pressed the remote and the crystal cage raised and its door opened. Marco ran to help Buff Frog get away with his tadpoles, and Toffee examined the wand with smug satisfaction.
"Gentlemen, it's been a pleasure..." Toffee said before the wand started to tremble and emit light. The monsters ran, Star took a step back into a fighting stance, and Toffee leaned over the wand expectantly... only for the rising tremors to fizzle out with a small poof of smoke. Toffee frowned at the still wand. He picked it up and held it close to his face to examine it, when the cover opened up. A fist popped out and socked him in the face, and from there Marco continued his assault even as he turned back to his human form. He picked up the stunned Toffee by his neck and held him face to face with a suitably crazed grin.
"Surprise!" With a final headbutt for good measure he flipped back to Star, who caught him in his wand form. Power erupted from the two as Toffee staggered to his feet, looking on in awed confusion.
"Soul resonance!" now the castle exploded, and more importantly Toffee was reduced to scattered ash surrounding a glowing red orb.
"Haha! I had my doubts about turning into a wand when we Woke up in the Soul Eater universe, but that was awesome!" Marco crowed as he turned human. He then cocked his head "My shadow clone just dispersed, Yvgeny and the tadpoles got away safely" Star grabbed his face and turned toward Ludo's egg
"Look! Nature." Ludo busted out of his shell as grossly as usual and looked around in confusion.
"Where's my castle?" Ludo asked
"It's gone." Star said calmly
"What's that red thing?" Marco walked over and picked up the item in question.
"Toffee's soul." he tossed it into his mouth, chewed for a bit and swallowed. He grinned at Ludo, showing many razor sharp teeth. "Delicious" Ludo paled and gulped, nodding numbly. Marco turned around leisurely and surveyed the damage. "Man, we did a number on this place, I kinda feel bad. Oh! Hey Star, let's see if we can use Soul Resonance to boost non-offensive magic!" they clasped hands and Marco turned into a wand once more. Their resonance thrummed in the air as Star lifted her wand over her head
"Maximum super castle reparo!" a shockwave of magic burst out from them, quickly shifting the rubble back into place as it went. When the spell was done the castle looked newly build rather than just repaired. Marco changed back and turned to Ludo with a smile
"There you go, that ought to help get back on your feet," His face darkened in an instant. "but just so you know, try to steal me again and I'll eat your soul."
It could always be worse
While Marco realized that his argument with Star got a quite a bit more heated than it should have, he still had no idea how they had managed to crash the loop. However it happened, he had served his time in Eiken and was now walking to school as usual. His ping got 2 replies, so they had at least one visiting looper, and as much as it pained him he kind of hoped Star wasn't awake. The visitors could be a good distraction while he cooled down and tried to think of how to patch things up with Star. Marco tried to concentrate on the lessons while he waited to be called to the principal's office, but his words to Star kept echoing in his head. He couldn't really place how the argument started, but he thought that saying 'Anyone would make a better princess than your baseline self!' was what had really sent it into a downward spiral. There was the announcement, he couldn't even bring himself to do the baseline gloating. As he approached he saw two unfamiliar people leave the office, dressed in Mewni royal garb. He sent another ping and the two turned to face him and replied. The woman was short with blond hair curled up like devil horns and the man was tall, gaunt and deathly pale.
"Hello! I'm Marco Diaz, local anchor, welcome to the Mewni-Earth multiverse, or 'Star vs the Forces of Evil' as it's called in the hub. We're not to the point of being able to offer sanctuary like Equestria, but with the danger centered on Star and me and a decent sized multiverse to explore this can make for a decent vacation loop. You seem to be replacing King and Queen Butterfly, so things ought to be pretty sedate for you for starters. Is there anything you'd like to do this loop?"
"Apparently I'm Mandy Butterfly and this is my husband Styx Johansen-Butterfly." The lady's scowl never left her face. "Where is the nearest place we can get a divorce or annulment or whatever?" Marco showed them his map of Mewni and gave them some advice on getting it done with the least political upset.
"If you don't feel like like ruling a country I can run the place from a shadow government or after a coup but for now I should get to Star." the pale man grinned evilly.
"oh she's not Star this loop. What she is, is your problem now!" he laughed as they disappeared through a portal. Some things clicked in Marco's mind. Styx, as in the river of the dead, and Mandy... that was Grim and Mandy, which leaves... Marco turned to the door of the principal's office apprehensively, praying he was wrong. No such luck. "Princess" Billy sat in a swivel chair, spinning around and laughing like an idiot, with the royal wand stuck up "her" nose. Marco slammed the door and took a deep breath.
"I, Marco Diaz, Pinkie Promise to never speak ill of Star Butterfly ever again, cross my heart, hope to fly, stick a cupcake in my eye." he took another deep breath and opened the door again
"Hello Principal Skeeves how can I help-" That was as far as he got before Billy's nose started to glow. Marco could barely process what was happening before the blast sent gore flying through the room.
Marco stumbled as he was walking to school. He cried to the heavens,
"I said a cupcake, not a skull fragment!"
