Instead of being raised by the Crystal Gems, Steven was found on Mewni as a baby by Star Butterfly. After he protected her from a monster, the two started to form a bond and he was later adopted by the Butterfly family, given the name "Quartz Universe Butterfly". After Star's 14th birthday, she was sent to Earth to get a better grip on her powers while Quartz stayed on Mewni, frequently making visits to his sister. Between fighting monsters and making new friends, their special bond grows stronger as the secrets of Quartz's true heritage begin to come to light.
Believe in the Weird and Wild contain examples of:
- Adaptational Badass: Due to being raised by a royal family of magic that's trained him since he was five, Steven is capable of beating up monsters and has great control of his shield, bubble, and floating abilities at age nine, while canon Steven only discovered his powers at age twelve and floundered with them for quite a while before learning how to really use them.
- Age Lift:
- Rather than being the age he was at the start of his series, twelve, Steven is nine when Star is sent to Earth.
- In canon, Connie is one-two years younger than Steven. Here she's one to two years older, in part because Steven's changed age would make her seven or eight otherwise.
- Alternate Universe Fic: The fic is set in an alternate universe where Rose lived on Mewni, helping the various Queens in protecting the kingdom. At some point she became pregnant and gave birth to Steven, and a young Star came across the child and the two were raised together as siblings.
- Armor-Piercing Question: After Steven and Star found about his real mother, Star gets angry with Moon for keeping it a secret. In an argument with her, she asks if she only kept Steven because of who his mother was.
- Dramatic Irony: Steven looks up to and idolizes Rose Guard, clueless to the fact that he's her son.
- Either/Or Prophecy: At some point between Star gaining the Wand and Glossyerick claiming her and Steven's fates were intertwined, Moon and River discovered an old scroll detailing a prophecy that Steven and Star will cause either everlasting peace and light, or never ending chaos and darkness.
- Interspecies Adoption: Steven, a half-Gem Half-Human Hybrid, was adopted by the Mewman Butterfly family.
- In Spite of a Nail: Despite the differences that come from Steven being raised as a Butterfly, certain events from both shows still take place, such as Star being sent to Earth, Steven turning into a bunch of cats, Steven meeting Connie, Star going through Mewberty, and Steven finding Lapis' mirror.
- The Last of These Is Not Like the Others: Of the spells Star goes through while trying to find one to impress Steven, the first two, summoning a tiny pink whale and creating a cheeseburger backpack blast, are Mythology Gags to Steven Universe, while the third, making a buffet of bacon pancakes, is a reference to Adventure Time.
- Not What It Looks Like: In chapter 3, River and Moon walk into the wand room after hearing noise and find Steven and Star in a bubble holding the Wand and multiple holes in the wall, Ludo near one of them. The two blame Ludo for it, and, as he's a monster and an enemy of the royal family, the king and queen don't question it and beat the stuffing out of him.
- Protected by a Child:
- Baby Steven protected himself and Star from a Corrupted Gem by forming a bubble around them.
- Moon is about to send Star to St. Olga's when Steven convinces her not to.
- Shout-Out: Star reads off some of her spells while finding one to impress Steven, one of them being "Bacon Pancake Buffet Blast".