Billy & Impossumon
Billy is the youngest of the three kids sucked into Sandy's Digital world. Before falling through a portal, he didn't have any Pokémon, and Impossumon is one hell of a Digimon for the first time you're working with a monster.
Impossumon is an anthropomorphic opossum, about chest height on an average 10-year-old, wearing a tattered, red, cartoon devil hooded onesie and oversized, purple gloves. Through tears in the onesie, exposed fur beneath can be seen, and his tail protrudes out from the back of a torn cartoon devil's tail, the lower half of which still flaps around. He evolved from Oppomon, a much smaller anthropomorphic opossum with no adornments.
Impossumon's signature attack is Hell's Blossom, where he clicks his fingers and a small flame appears above his hand. With a flick of his wrist, it flies out of his hand, splitting into hundreds of small embers about the size and shape of a cherry blossom petal, and which hones in on the enemy.
Lois and Buzzermon
Lois was on her way to see her local Pokémon professor to get her starter Pokémon when she fell through a portal to Sandy's Digital World. She generally isn't a fan of bug types, but Buzzermon is warming to her.
Buzzermon resembles a terrier sized bee - Her six legs and four wings coming out of her elongated, black and white, fuzzy body, her large bug-like eyes and mandibles take some getting used to at that size, but she has a cuteness from a certain perspective. She evolved from Bumon, which resembles a flying, fuzzy, black and yellow tennis ball with four wings.
Buzzermon's signature attack is Buzzshot, where she fires four stripes of electrical energy out from her wings at her foes.
Thomas and Ballermon
Thomas - Elder brother of Billy - Had just earnt his second gym badge when a portal appeared, bringing him but not his Pokémon to Sandy Version's Digital World. Upon arriving, Ballermon, as Ballmon, declared him to be his new best friend.
Ballermon is a Child stage Digimon with a soccer ball for a body, which is also his head. Out of that are two arms and legs, about the same size as Thomas's limbs, each ending with a soccer ball in place of hands and feet. He evolved from Ballmon, a soccerball size and shaped Digimon with an unnerving amount of teeth.
Ballermon's signature attack is Hail Strike, where he materializes a giant ball of ice in front of a foot and shoots it like a soccer ball at his foes