Little Witch Academia (2017): The promotional art for Episode 12, "What You Will" by animator Takafumi Hori is identical to an episode promo of the Steven Universe episode "Last One Out of Beach City" (Hori was a guest-animator for the episode "Mindful Education.")
Batgirl: In Volume 4 Issue #41, Garnet and Pearl can be seen◊ in the background of a club. Hilariously, the comic managed to predict "Bad Pearl" by over a year.
Tommy from Like No Other Boy watches Steven Universe after he and Chris get home from the zoo.
In The Many Half-Lived Lives of Sam Sylvester, Sam and Shep are both fans. Sam, who is nonbinary, tells the principal, "I'm not a girl. I'm an experience." Shep has Steven Universe patches on her backpack, and her ringtone is "Stronger Than You."
In I Wish You All the Best, part of the reason Ben and Mariam are friends is that they both love Steven Universe.
In xkcd Hoverboard, Darth Vader can be seen explaining Steven Universe to one of his subordinates. The Crystal Gems can also be found on the same ship.
In the FU DW episode "DW BURNS DOWN HER SCHOOL", host Matt quips that if the Arthur episode "D.W. All Fired Up" was made today, it would likely be about a school shooter drill rather than a fire drill. Steven then appears to call him out on saying this.
Adventure Time: In the Stakes miniseries, a vampire known as "The Empress" wears a scarf on her head with a jewel matching Steven & Rose Quartz's gemstone, which is used to project ring-shaped beams.
One of the things in the junk pile seen in the pilot episode is a doll of the title character.
In "Bring Out Your Beast", Craig sings the Lil Butler theme song while washing dishes.
In "Council of the Creek", Bernard eats Craig's Cookie Cat.
In "Jessica's Shorts", the family is shown to support Marty's disgusting Guacola drink.
"Little Butler" is a board game that Craig plays with his family.
Kelsey is enticed by a pair of purple singing boxing glo-oh-oh-OH-oves with yellow stars that'll make her "stronger than you".
In the Mao Mao: Heroes of Pure Heart episode "Popularity Conquest", Mao Mao wanting to be popular among the Sweety Pies, ends up changing his image to what is essentially a Take That! to Steven Universe. He dons similar clothes, acts more laid back and non-aggressive, overly kind, changes his sharp tooth smile into a "bean mouth" and at one point tries to stop a monster attack by singing it a song accompanied by a ukulele (it didn't work).
The Power Crystal in Shannon's chest is the same size, shape, and color as Peridot's gem.
K.O. will frequently gain star eyes when he's excited or in awe, complete with the same sound effect.
In one of the stages of the game, you can clearly see some "Missing" signs with Steven's face on them.
In "Just Be a Pebble", when giant K.O. is about to eat a cloud like cotton candy, Rad tells him "Do ittt!" in the same way Amethyst says to Steven in "Secret Team."
The arcade in the plaza is called Neo-Rama Game Center. Neo-Rama is the online username of Lamar Abrams, a character designer on the Lakewood Plaza Turbo pilot, and a storyboard artist on Steven Universe.
In the middle of "No More Pow Cards," when KO and Dendy decide not to get rid of their Pow cards, there's a star shaped Iris Out (again, complete with the exact same sound effect), which gets interrupted when the two decide they're not done yet.
When Enid arrives at P.O.I.N.T. Prep Academy, she meets Miss Pastel and her friend is Koala Princess, which is also the name of a DVD series of which Ronaldo Fryman is a fan.
In the thirty-sixth episode of Uncle Grandpa's first season, "Haunted RV", a boy on a scooter can be seen wearing attire similar to Steven's.
We Bare Bears: One of the dudes Grizzly interacts with in "Everyday Bears" looks like a thin, older Steven.
for Episode 12, "What You Will" by animator Takafumi Hori is identical
