Spinel

"You can't just make everything better by singing some stupid song!"

Spinel is the main antagonist of Steven Universe: The Movie.

Current
Spinel has a pink complexion, magenta eyes, a small pointy nose, and magenta hair that is styled into a pair of pigtails. She also has three black lines underneath both of her eyes, reminiscent of running mascara. Her clothing consists of a dark magenta top, puffy hot pink sleeves, puffy magenta shorts, hot pink wrist-length gloves, white stockings and a pair of magenta knee-high boots.

Her gemstone is located in the center of her chest, cut in the shape of an upside-down heart.

Previous
When reset to her original self, Spinel had black cartoonish looking eyes, and her hair was styled into a pair of heart-shaped buns. Her top was white with more rounded pink sleeves, and her boots become a pair of big magenta shoes. Overall, her appearance was similar to that of an old-fashioned cartoon.

Her gemstone is now flipped to resemble a normal heart.

Personality
Originally, Spinel had a goofy, fun-loving personality, being Pink Diamond's best friend to the point of being clingy.

In stark contrast to her original personality, upon being abandoned — and learning that Pink is gone (and that Steven has taken her place) and of Pink's other friends — Spinel is bitter, full of resentment towards Pink Diamond, Steven Universe, and all of their affiliates.

Due to her abandonment by Pink Diamond, Spinel is prone to outbursts of extreme anger when reminded even indirectly that Pink Diamond forgot about her. This is seen when her face contorts with untapped fury after Steven asked who she was.

Despite her anger, Spinel is somewhat trusting as she is willing to go along with Steven to stop her injector before she sees the Rejuvenator and believes he wanted to reset her. Having been betrayed for a second time, Spinel immediately decides she hates Steven personally.

Spinel is ultimately not an evil Gem, displayed when she shows remorse after Steven saves her and tearfully asks why she wants to hurt him and everyone else. Spinel is also mature enough to understand she will have some difficulty creating friendships after what Pink Diamond put her through, but is willing to start over with White, Blue and Yellow.

6,000 Years Ago
Spinel was created for Pink Diamond thousands of years ago to act like her best friend, often playing games with her and entertaining her. However, when Pink was finally given her colony, Earth, she abandoned Spinel at the Garden that was built for them, telling her that they were going to play a new game which involved Spinel waiting for Pink's return. Pink never returned, and Spinel continued waiting.

"Steven Universe: The Movie"
After 6,000 years of waiting, Spinel finally had gotten news on what has become of her Diamond. She learns that Pink Diamond no longer exists and had given up her physical form to give birth to her son, Steven. After learning this and also realizing the fact that her Diamond abandoned her, she changed her appearance and swore vengeance on Steven and Pink's "new friends".

Later on that same day, Spinel arrived on Earth on a massive injector with which she began filling the ground with poison. Spinel began to fight against Garnet, Amethyst and Pearl, her stretching ability and chaotic method of movement allowing her to easily defeat them with her Gem Rejuvenator. Furious, Steven manages to grab hold of her weapon and poofs Spinel with it as well.

After the battle, Steven brings the poofed gems (including Spinel) to the temple where he learns, after the Crystal Gems had reformed, that they have lost their memory. Not too long after this revelation, Spinel reforms too and acts oddly friendly and playful towards Steven, calling him her new best friend.

Throughout the movie, Spinel would follow Steven everywhere he went and would "help" him get his friends' memories back. While doing so, she would also try to play with him, but never gets the chance to, due to him being too focused on helping his friends. After helping Amethyst, Steven and the other remaining Crystal Gems learned that the only one who can stop Spinel's injector is Spinel herself, but in order to do that they need her to remember who she is and since Pearl is the only one who seems to know her, the group decides to help her next.

That evening, Spinel would join Steven and the other Crystal Gems at the Abandoned Warehouse, where they would try to get Pearl to regain her memories by listening to a song written by Sadie Killer and the Suspects ("Disobedient"). When that didn't work, Steven figured out that the only way Pearl would be able to think for herself, as well as regain her memories, is if her owner "disappeared", just like Rose did. To do just that, Steven fuses with Greg (who Pearl thought was her owner) and forms a new fusion named, Steg. Steg then sings a song ("Independent Together") that helps Pearl remember who she is and later duets with him (as Opal).

Although the song had succeeded in helping Pearl, it caused Spinel to see that Steven cares more for his friends than her. Upset, she flees to Pink Diamond's Garden, where she tells Steven the story of her past as well as her abandonment ("Drift Away"), causing her to return to her former self. Steven, feeling bad for Spinel, befriends her and brings her back to the Gems and Connie, who, after initially being wary, agree to let Spinel help Steven in deactivating the Injector.

Upon deactivating it, Spinel is once again hurt by Steven's reaction. She then claims that he only needed her for the Injector, and did not want to be her friend and that he would just get rid of her, the source of his problems. Thinking he will betray her as his mother did, she pushes Steven, making him drop the Rejuvenator. Freaking out in anger and betrayal, paranoid that Steven would send her back to her default, she resorts back to her old behavior and attacks Steven, and threatens Garnet. This, however, causes Garnet to regain her memories as well. After being beaten by the Crystal Gems,  Spinel then retreats to the top of the Injector and is soon followed by Steven, who then tries to talk to her. This further infuriates her, causing them to fight, until it becomes apparent she has lost her motivation to destroy him and regrets her actions up until that point. Steven, now fully reunited with his powers, comforts her and claims she can start fresh with new people to be her friends. The Injector then explodes due to the battle, and Steven saves Spinel by entrapping her in his bubble alongside him. Steven then attempts to comfort her again, as Spinel decides she has created too much damage and must leave. The Diamonds then arrive, ready to confront Steven about where they will live and Steven introduces Spinel to them, thus giving her the new friends he promised. Spinel then says goodbye to Steven and leaves Earth alongside the Diamonds, happy to be loved again.

Abilities
She presumably has all the powers of a normal Gem.

Skillset

 * Scythe Proficiency: The non-summoned weapon that Spinel wields is the Gem Rejuvenator which has the appearance of a scythe. Spinel was adept enough at wielding it that she was easily able to defeat three of the Crystal Gems. In conjunction with the weapon, Spinel's ability to stretch works greatly in her favor as it allows her to greatly increase the range of the scythe allowing her to swipe at many different angles and increase the power behind it when she stretches far enough allowing the recoil to strengthen the attack made by the weapon.

Unique Abilities

 * Elasticity: Seemingly looking like an old-fashioned cartoon, Spinel's attack patterns and movements are akin to it as well. She is extremely elastic and malleable, able to stretch her limbs and torso to great lengths and inflate body parts to strengthen her attacks. She uses this to increase the range of her attacks, able to reach enemies from a distance. She can also coil her extended limbs to form a spring with an inflated fist at the end. Though, this could just be a specialized or subset skill of the normal Gem ability of Shapeshifting. She's even able to coil one of her fingers into making a type of horn that activates and deactivates her injector.

Pink Diamond
Spinel was Pink Diamond's playmate and "best friend". Created solely to entertain Pink, Spinel considered herself to be Pink's best friend, and for a time, the two were inseparable. However, they gradually grew apart as Pink yearned for more responsibilities and more maturity. Oblivious to this, Spinel continued to attempt to entertain Pink, her attitude now seeming more immature in comparison. She also became clingy; upon Pink's allocation of Earth as her colony by the Diamonds, Spinel was intent on joining Pink on this new endeavor.

Very reluctant to allow Spinel to join her, Pink created a "new game" to get rid of her from her side, in which Spinel should wait for her return in the same spot, and never move. Spinel obliged and waited over 6,000 years for Pink's return. When Spinel finally realized that Pink had abandoned her after watching Steven's announcement on the Diamond Communicator, hurt and sorrow consumed Spinel, resulting in her taking on her current form and hunting down Steven to take revenge on Pink.

Pearl
The two were acquainted with one another as members of Pink Diamond's court, but presumably never interacted much. When Spinel and Pearl encountered each other for the first time in thousands of years, Pearl experienced shock over Spinel's return.

While the two never interact properly, it seems that Spinel holds a fair amount of resentment towards Pearl since Pink Diamond took Pearl with her to earth but left Spinel behind. This is evident when Spinel mentions it and is barely able to keep herself from screaming in anger.

Steven Universe
Spinel sought out revenge on Steven due to him being the descendant of Pink Diamond, as stated by his broadcast, and she was jealous of the fact that he, or "Pink", now had new friends that were not herself. Hurt by Pink's abandonment, she vowed to destroy Steven's new friends and the planet that Pink had loved so much. Steven accidentally poofs her, perceiving her as a threat once she has poofed Garnet, Amethyst, and Pearl.

However, upon her regeneration, the two become mutual acquaintances, with Spinel resuming her 'Best Friend' status with Steven, as she did with Pink. The two are inseparable, with the relationship heavily skewed; coming mostly from Spinel. Upon a small disagreement where Spinel sees Steven caring more for his friends than her, she flees to Pink Diamond's Garden, where she tells Steven the story of her past. Moved, and desperate to reform the Gem, Steven brings Spinel back to the Gems and Connie, who, after initially being wary, agree to let Steven help Spinel to deactivate the Injector.

Upon deactivating it, Spinel is once again hurt by Steven's reaction; he claims he only needed her for the Injector, and did not want to be her friend. Resorting back to her old behavior, Spinel attacks Steven, before retreating to the top of the Injector.

Steven ascends the injector to talk to Spinel, and they fight until it becomes apparent she has lost her motivation to destroy him and regrets her actions up until that point. Steven, now fully reunited with his powers, comforts her and claims she can start fresh with new people to be her friends. The Injector promptly explodes due to the battle, and Steven saves Spinel by entrapping her in his bubble alongside him. Steven then attempts to comfort her again, as Spinel decides she has created too much damage and must leave. The Diamonds then arrive, ready to confront Steven about where they will live, and Steven introduces Spinel to them, thus giving her the new friends he promised.

Trivia

 * Her design, gloves, eye pupils (at least in her first form), and stretching abilities seem to be based on old-fashioned cartoon characters of the 1930s-era "rubber hose" animation style, with long hose-like limbs bending and stretching freely.
 * Her stretching ability is somewhat similar to the stretchy powers of Jake from Adventure Time, which Rebecca Sugar was a storyboarder on.
 * Her hair is similar to Mickey Mouse's ears; regardless of which direction she faces, it always stays along the outline of her head.
 * Spinel's stretchy powers are possibly based off of Monkey D. Luffy from One Piece, as Rebecca Sugar has stated it's one of her favorite anime series.
 * Her original form's heart-shaped hairstyle is reminiscent of Sailor Chibi Chibi from Sailor Moon.
 * Her outfit's design and the position of her gem resembles that of Pinkie Pie from, Equestria Girls.
 * Her name was alluded to in some of the earliest promotional material where her gem was spinning.
 * The spinning gem in the promo is also most likely a reference to her gemstone, which was revealed to be rotated upside down.
 * Spinel is the only Gem besides Pink Diamond to have rotated her gem's position.
 * Spinel also seems to be inspired by or at least was meant to be a court jester of sorts, having been created strictly to entertain royalty.
 * Along with Lapis Lazuli, Bismuth, Carnelian, Holly Blue Agate, Emerald, and Watermelon Tourmaline, Spinel is the sole individual of her Gem type seen in detail.
 * Spinel is a gemstone that dispels negative energy by purifying it, and it is also known to increase creativity and preserve youthfulness. While the former could be analogous to her positive and goofy (former) personality, the latter might be an ironic jab towards her use of the Gem Rejuvenator.