LWP: Steven Universe

Steven Universe: Steven Quartz Universe is the titular main protagonist of the Steven Universe franchise. He is the son of Greg Universe and Rose Quartz/Pink Diamond, the only known hybrid of a human and a Gem and the first Crystal Gem of human descent. As a result of his parentage, Steven is an extraordinarily unique being with innate powers beyond that of normal humans and Gems. While he was only a child, Steven steadily grew from a tag-along to the Crystal Gems into the heart of the team thanks to his kind-hearted nature and resourcefulness.

Pearl: Pearl is a member of the Crystal Gems. She was Pink Diamond's second Pearl, and one of Rose Quartz's closest followers and her sole confidant. Pearl is one of the last surviving Gems on Earth who joined the Crystal Gems in their rebellion against the Gem Homeworld. Pearl would afterward protect the Earth over the next several millennia alongside her friends, while later teaching Steven the ways of Gems.

Amethyst: Amethyst is a member of the Crystal Gems. She is the last known Gem manufactured on Earth as a part of the Gem Homeworld's Kindergarten project, being one of the last surviving Gems on Earth. After being found by Rose Quartz and the other Crystal Gems, Amethyst helped her friends protect the Earth over the next four millennia, and often aids in the shenanigans of Steven Universe.

Garnet: Garnet is the fusion of Ruby and Sapphire and the current de-facto leader of the Crystal Gems. Garnet is one of the last surviving Gems on Earth who joined the Crystal Gems in the Rebellion against the Gem Homeworld and afterward assisted her friends in protecting the Earth over the next few millennia. After Rose Quartz gave up her physical form to give birth to her son, Steven Universe, Garnet took over as the leader of the group.

Greg Universe: Gregory "Greg" Universe is the father of Steven Universe and was the romantic partner of the late Rose Quartz. He is the current owner of It's a Wash.

Connie Maheswaran: Connie Maheswaran is Steven Universe's best friend-turned-girlfriend, and a member of the Crystal Gems who debuted in the episode "Bubble Buddies". After meeting Steven, she slowly began to learn about him, the Gems, and their past. Growing a strong bond with them, Connie decided that she wanted to help him and the Crystal Gems whenever danger arose in the Earth, training how to fight using a sword with Pearl since "Sworn to the Sword". She eventually becomes a skilled combatant and often aids the Gems during times of conflict.

The Darkness: The Darkness is a black inky static-like substance that when someone living or dead touches it, they become a mindless monster that will either spread the corruption to others or kill others. It also makes the corrupted beings say slang from the Internet back in 2016.

Steven Universe World: This world is a TV-PG world, so the characters here will see actual gore and blood for the first time in their whole lives. And they don't even know what that is, so they refer it as "Red Slime" or "Red Water". Also, they don't know what the slang the corrupted beings are saying, so it's basically foreign to the characters here.

And yeah, there's other characters from tons of different franchises, such as Adventure Time, Rick and Morty, Super Mario Bros and more TV-SHOW/Video Game worlds. That includes the animes too. And the Steven Universe characters shouldn't know characters from other franchises are called.