Minor Animal Characters are animals that have appeared but, as of yet, have no significant or recurring roles.
Blue Crabs
Blue Crabs are a variety of crabs first appearing in "Steven and the Stevens". When Steven decides to go to It's a Wash, the crab comes before him, and Steven tells him "After you, sir.".
A similar blue crab appeared in "Lion 3: Straight to Video". Rose Quartz recorded the crab with a video camera before Greg was ready to introduce himself to Steven. A bunch of blue crabs were seen in "Say Uncle" when Uncle Grandpa showed up in the beach.
In "Are You My Dad?", Pearl and Garnet build a sandcastle to house two blue crabs.
They strongly resemble the Chesapeake Blue Crabs.
Butt Lobster
The "Butt Lobster" is a lobster that clings onto Pearl's posterior in "Steven and the Stevens", prompting Garnet to point out that she has a lobster on her butt.
The Crystal Gems warped back from the Sea Shrine and, as a result, the lobster came along with them, along with a fish, an octopus, and a crab. Pearl was not aware that the lobster was on her and was startled when Garnet pointed it out. Its current whereabouts are unknown.
It strongly resembles The Australian Lobster.
Cat Steven's Siblings
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Cat Steven has Four Siblings that appeared in "Pool Hopping". One resembles a mackerel tabby, a black cat, a white cat, and a tuxedo cat.
They were put up for adoption at the end of "Pool Hopping" with their current whereabouts being unknown.
Dog
The Dog appears in Steven's dream sequence in "Steven Floats". The dog is brown and short and has 3 teeth showing as well as its tongue sticking out. It bears a resemblance to a chihuahua.
In the dream Steven has, Steven is afraid that he will not get his donut. Steven imagined that Sadie fed his donut to the dog.
Mask Island Fish
The Mask Island Fish are creatures that inhabit the waters around Mask Island. They've only appeared in "Island Adventure".
There seems to be magenta- and salmon-colored variations of these fish. Similar to the rest of the creatures on Mask Island, these fish seem to bear a smiling expression, even after being stabbed by Sadie while she's fishing. However, after being cooked by Lars, these fish instead appear to have sad expressions on their faces.
Seagulls
Seagulls have appeared in various episodes including "Monster Buddies", "Watermelon Steven", "Sworn to the Sword", "Steven Floats", and "Bismuth". They look like typical seagulls, having white feathers and yellow beaks. They are often seen searching for food. Unlike many seagulls in real life, the seagulls that occur in Steven Universe are not afraid of the close presence of humans, and will only cower if threatened.
They strongly resemble American Herring Gulls.
Snake
In "Keep Beach City Weird", the Snake is seen on the hill outside the Lighthouse. It hisses at Steven before slithering away from him. It is dark teal with a light green belly.
It strongly resembles the Bluestripe Garter Snake.
Steven the Third
"Steven the Third" is one of Steven Jr.'s goat kids.
Steven the Third lives with its parents and one sibling at the Sky Spire. As Steven The Third was not seen when the Crystal Gems first visited the location in the episode "Giant Woman", but rather made its first (and so far only) appearance in "Warp Tour", its date of birth probably occurred some time between the two episodes.
It strongly resembles a Fainting Goat.
Raccoon
In the episode "On the Run", the Raccoon was seen traveling along with Steven and Amethyst. It is gray, with a black and white, striped tail. It has white eyes with black circles around them and white ears along with black fur on their outsides.
It strongly resembles the North American Raccoon.
Onion's Mouse
Onion's Mouse is a mouse owned by Onion, first appearing in "Onion Friend".
Onion was originally going to feed the mouse to his pet snake, upsetting Steven. To make him feel better, Onion did not kill the mouse, and instead hid it in his mouth for the duration of the episode.
It strongly resembles the Common Field Mouse.
Onion's Snake
Onion's Snake is a pet that Onion currently owns. The snake made its debut in "Onion Friend". It lives in a darkened terrarium that sits on a dresser across the room from Onion's bed. It is unknown what the snake's name is.
It strongly resembles the Blue Python.
Party Guy
"Party Guy" is an unseen snake mentioned in "Gemcation". Residing at Cool Ranch, Pearl and Amethyst encounter Party Guy. Pearl starts screaming, and Amethyst informs Steven and Greg of the snake, referring to it as a 3-foot-long, hissing, reptilian "party guy".