The Heroes of Eeveelution were the result of an experiment of "mixing" humans and Pokemon. Glaceon Boy is part boy, part Glaceon. Eevee Person is part girl, part Eevee. Being part Eeveelution, they can perform any attack that their Eeveelution could learn. As for their appearance, Eevee Person has brown hair, Glaceon Boy has black hair covered up by his Glaceon-like hat, and they both have their Eeveelution's ears and tail.
When they aren't fighting crime and being awesome, they're at their secret superhero lair with their partners Sylveon and Sheevee.
Sheevee (short for Shiny Eevee) had the ability to transform into any Eeveelution at will. And Sylveon was... just a Sylveon. Oh well. Maybe she has some cool superhero powers that nobody's found yet.

Now that the explanations are out of the way, let's see what our Heroes are doing now...

"Sheevee, why are you sniffing that rock?" Eevee Person asked. Sheevee was sniffing a rock.
"It smells like candy!" the white-furred Eevee barked.
"Then eat it," Sylveon shrugged.
"But it's a rock!" Sheevee protested.
"...Okay."

"GUYS GUYS GUYS GUYS GUYS!" Glaceon Boy ran over to the group. "LOOK AT THIS!"
"Let me guess," Sylveon rolled her eyes. "You're gonna start ranting about how horrible shades are."
"They're terrible! But that's not the point," he shoved a newspaper in the Fairy-Type's face.
"I call dibs on the comics section!" Eevee Person grabbed the comics section and started reading.
Glaceon Boy took the comics away from his partner and showed her the front headline: NINJAKIN STRIKES AGAIN

"Ninjakin? Who's THAT?" wondered Sheevee.
"Not much, just an overpowered ninja Fennekin that terrorizes the city." Sylveon shrugged.
"Overpowered? Terrorizes? Fennekin? City? Ninja?!" Eevee Person repeated.
"Yes, that's what I said."
"Well, sounds like a bad Pokemon. And we're superheroes... LET'S DO THIS!" she fist-pumped.
"YEAH!" shouted Glaceon Boy and Sheevee.

Glaceon Boy took the wheel as the heroes got into their Jolteon car.
"Why is it a Jolteon car?" Sheevee asked, her fur being buffeted by the wind. "Why not something that flies?"
"Because there are no flying-type Eeveelutions," Eevee Person shrugged.
"Darn."

"Guys! I think I see the Ninjakin!" Sylveon said. She was right. Right in front of them was a Fennekin with a ninja outfit on and an evil glint in her eye. "So, are you two gonna defeat her, or start saying your motto stupidly?"

"PREPARE FOR TROUBLE!" Glaceon Boy shouted. Sylveon face-pawed.
"MAKE IT DOUBLE!" Eevee Person added.
"WE BLAST OFF AT THE SPEED OF LIGHT!"
"WE'RE NOT LEAVING WITHOUT A FIGHT!"
"GLACEON BOY!"
"EEVEE PERSON!"
"Sylveon, that's right." Sylveon groaned.

"Hey, where'd she go?" asked Sheevee.

Ninjakin was gone.

-
So yes, this is part one of our heroes' first adventure. if you wanna edit anything let me know.
I'm REALLY sorry I was so slow with posting this xD I'm lazy.