This is mostly just a bunch of headcanons thrown together at a wall with a vague semblance of plot, and a hecka lot of worldbuilding. There's a possible dark ending, depending on how it goes. Slow burn Sportarobbie..? I'm not sure if it will actually crop up. In any case, all the kids show up as characters and so do vague OCs in place of actual parental units. And yes, I actually use the kiddos as characters. They will be very much so involved in this story.
"Alright kids, the sun will be going down soon!"
Sportacus laughed as the children groaned and whined but eventually trailed off to their houses to get ready for bed. Their basketball game had gone on and on until it was almost time for Sportacus to go to bed. Since it was summertime it was just about getting dark and the perfect time for the kids to go home, eat supper, clean up, and go to sleep nice and early.
Ziggy had to be walked home, so Sportacus took the boy up on his shoulders and jogged there. They had fun playing a quick game of horse racing until Sportacus handed Ziggy off to his tiredly smiling mother. Waving goodbye, the door had hardly closed before Sportacus was turning around in response to a dry voice.
"There's dum-dum flavored drool on your hat."
Sportacus jumped and blinked in surprise when he saw the town's resident villain standing at the end of the walkway. He reached a hand up reflexively and winced at the slightly sticky damp patch on his beanie.
"He shouldn't have been eating candy while I was running, he could have choked." Sportacus mused with a look of thought. "What are you doing out so late, Robbie?" He asked, smiling slightly.
"Walk with me, Sportacus." Robbie didn't linger, turning around with a flair and waving a hand behind him as soon as the words had left his mouth.
Sportacus still wasn't entirely used to LazyTown and the strange role Robbie Rotten played in it but he was more than accustomed to the man being overly dramatic and slightly less than sincere with everything he did. Now there was a strange aura of seriousness around him that made Sportacus feel on edge. He tapped his crystal once, twice and got a strange feeling of stepping off the deep end of a pool from it. The feeling that you got when you knew you could swim, that it wasn't dangerous, but there was still a sensation of expectancy that didn't really make sense.
It wasn't any sort of danger, that much Sportacus could tell. He hadn't really expected his crystal to give him anything anyways. He just tapped it for comfort most of the time.
Now thoroughly curious Sportacus fell easily into step behind Robbie, despite having much shorter legs.
"Is there something you wanted to talk about?" He asked curiously.
"Yes." Again there was no teasing, no exaggerated emphasis to his words. It wasn't even a long over complicated sentence. Just one word.
They continued walking for a few more minutes in awkward silence before Robbie came to an abrupt stop. Sportacus had been walking beside him and kept going for an awkward half step before realizing.
"Yes, Robbie?" He prompted when it seemed like he'd stay silent.
He almost thought he'd have to say something more when Robbie finally spoke.
"What are you doing here?"
It was so quiet that even with his sharp ears Sportacus though he'd misheard. Then his ears picked up exactly how silent it was. They'd walked to the edge of the town but it should not be so dark yet, much less this silent. Sportacus's ears strained to hear something. A cricket, the wind, something.
"I don't understand." Sportacus barely restrained a nervous stutter. His hand reached for his crystal and it simply hummed against his hand, no message.
"Let me rephrase." Robbie looked up from the ground and his eyes were narrowed lazily, like a cat. "What are you doing in My Town, elf."
Sportacus tensed. The emphasis was not missed. His crystal buzzed, still not a warning, still no danger, but caution, so much caution.
Robbie, seeing he'd gotten his attention, straightened up fully for one of the first times to Sportacus's knowledge. He stood lightly, regally; his eyes continued to watch the sports elf with a half-lidded gaze that made Sportacus's spine tingle.
Suddenly, many things snapped into place. A layer of Robbie Rotten had peeled itself off and withdrawn. The elf's eyes widened as he felt his senses shift and clear up. He tensed even more at the clear source of magic standing in front of him.
"My apologies for intruding, I wasn't aware there was a fae in LazyTown." Sportacus nodded his head respectfully. "I mean no harm. I'm merely here to help and play with the children."
Elves were, traditionally, stronger than fae by a large margin. But fae were notoriously possessive of whatever they considered theirs, and outright vicious in the ways they protected their belongings. Robbie claiming LazyTown meant bad news to any being who dared bring trouble into his territory. Sportacus understood why his crystal had yet to go off. He certainly had zero plans of harming LazyTown!
"Elves very rarely simply play with children." The fae sneered, and Sportacus could see glints of the Robbie he'd known behind this angry creature.
"I can swear to you, I have no intention of harm on these children." Sportacus very clearly held his hand over his crystal. He would swear it, even to a fae. Never in his life would Sportacus willingly or intentionally hurt a child, much less one of his new friends in LazyTown.
Robbie's eyes narrowed further. Sportacus wondered briefly how he could still see.
"Swear it, to cover the whole town, and I will allow you to stay." Without possibility of death, it remained unsaid.
Sportacus knew now that Robbie's ineffective attempts at getting him to leave had been a subtle warning. If Robbie truly wanted him gone the fae would have found far worse methods. However even Robbie could not deny that Sportacus was a good influence for LazyTown and to run him out would only harm his territory more than help. Such was a decision that Robbie no doubt despised making but as a fae could not refute. Fae could no more harm their belongings than rip out their own magic.
Despite his sincerity, Sportacus paused. "Is this a Deal?" He asked carefully. He was not naïve enough to walk into a Deal with a fae without forethought.
Robbie snorted. More and more of his normal persona was leaking through. "Not truly. Instead of a Deal, a deal. Not absolutely binding. Still enough to hold both of us to it and piss me off if you break it." He grinned wider than humanly possible with sharp fangs.
'And he would probably attempt to destroy me outright for simply harming his town.' Sportacus mused. 'Breaking a deal, lowercase emphasis or not, would simply be extra encouragement to kill me.'
"Then it is a deal." Sportacus nodded and thought over his words carefully for a minute. "I, Sportacus, do Swear that I intend no harm upon LazyTown or its inhabitants," The elf had a hand placed carefully to his crystal, where magic radiated from it in a soft buzz that both could feel. "And that I only wish to help them when my assistance is needed or wanted."
"And in turn I, Robbie Rotten, grant you leave to remain." The fae tilted his head carefully to the elf as magic buzzed in the air. It wasn't a Deal, or they'd both feel the bind as it struck, but there was still power behind it. With that done Robbie gave him a dark look. "I'm watching you, Sportaloser." With a strange slide of perception Robbie's slouch was back and he was hidden under the guise of a human once more. A snap of his long fingers and he disappeared. Sounds of nighttime filled the air.
Sportacus stood there a few moments as he tried to get his breathing under control. He wasn't in danger, no, but it was risky to cross a fae's belongings. He was lucky Robbie hadn't flat out attacked him first.
...that and, well, Robbie's regal bearing had been rather flattering. Sportacus wasn't sure the skipping of his heartbeat was solely from the excitement of making a halfway deal with a fae.