Crystal gems (and other characters too)

Garnet:she is Ruby and Sapphire fusion

The Crystal Temple's rooms are pocket dimensions accessed by activating the resident's gemstone through the Temple Gate, with each room reflecting the Gem's personality and characteristics. The temple is powered by a Crystal Heart, similar to Homeworld technology, which serves as its power core. Each room is a mutable, personalized space that can be created or altered by its inhabitant, with fusion rooms only appearing when the fusion is active.
This video explains the power source of the Crystal Temple and how it functions:

Accessing the Rooms
Temple Gate: A central gate located at the entrance of the temple features symbols for each of the Crystal Gems.
Gem Activation: Activating a Gem's gemstone causes their corresponding symbol on the gate to glow, which unlocks and opens the entrance to their room.
Room Characteristics
Personalization: Each room is a unique, custom space that reflects the inhabitant's personality, history, or how they were formed.
Mutable Nature: Rooms are not fixed and can be created, altered, or even vanish based on the whim and will of the Gem who lives there, as seen with Sardonyx creating a talk show.
Fusion Rooms: Fusion rooms are only accessible when a fusion is actively formed; otherwise, the space breaks apart, according to the Fandom wiki.
Rose's Room: A distinct exception, Rose's room is made entirely of clouds and is a simulation of her desires and memories

Power Source
The Crystal Heart: The temple's entire interior, including the rooms, is powered by a Crystal Heart, which functions as the temple's core and is connected to its most dangerous areas.
Advanced Technology: The Crystal Heart is not purely magical but operates on advanced Gem technology, similar to power cores found on Homeworld ships

Key Characteristics of the Rooms
Customization: Gems can program and create new rooms and spaces within the temple.
Fusion Rooms: When a fusion is formed, their room also appears, but it breaks apart if the fusion unfuses.
Burn

To Rose Quartz (the former Pink Diamond), the Crystal Gems were her chosen family and the revolutionary force she assembled to fight for the freedom of Earth and its inhabitants against Homeworld's colonization and oppression. After faking her own shattering to escape her role as a Diamond, she took the form of Rose Quartz and, with her loyal friends Pearl, Garnet (a fusion of Ruby and Sapphire), and Amethyst, formed the Crystal Gems, an alliance dedicated to protecting Earth and promoting the belief that life is precious
Guardians of Earth: Their mission was to protect Earth from Homeworld's attempts to colonize and exploit it, a cause that became Rose's overriding purpose and the foundation of the Crystal Gems' existence.
A Symbol of Hope: Rose Quartz, and by extension the Crystal Gems, represented a new way of life for many Gems—one focused on love, individual expression, and a rejection of Homeworld's tyranny

the crystal gems kill other creatures with a gem and bubble their gem becasue they are either cracked, corrupted or just evil, and their bubbled gems are stored in the temple in search for a way to fix them or turn them good

The Crystal Gems—Garnet, Amethyst and Pearl, —live at the Crystal Temple on the Beach City shoreline, a sacred, ancient structure they use to protect Earth and bubble cracked or corrupted gems

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Gems (General Abilities)
Shapeshifting: Most gems can alter their physical form to a degree.
Weapon Manifestation: Gems can summon weapons that are a projection of their inner gem power.
Healing: Gems can retreat into their gem to heal damage, and they can be rejuvenated in a facility called The Reef.
Fusion: By combining their forms and powers with another gem, they can become a more powerful, unified being.
Energy Projection: Gems can direct energy through their weapons, and some can generate electricity or heat.

Other Key Characters
Ruby and Sapphire: The two Gems that form Garnet, their love story is central to the show's narrative and highlights the freedom and power of choosing to be together.
Connie Maheswaran:A girl who grows from a reserved girl into a brave warrior and develops her own sense of self-worth despite being a human among powerful magical beings

Other Notable Gems
Lapis Lazuli: A water-controlling gem who can form powerful constructs and fly with her water wings.
Peridot: An analytical gem with advanced knowledge of gem technology, who can use her hand-propellers to fly.
Bismuth: A strong warrior known for her ability to manipulate metal and take the form of a large weapon

Pearl: A loyal and perfectionistic gem who excels at weapon manifestation and is a skilled tactician

Garnet: A wise and composed leader who uses her gauntlets to fight and can see into the future

Amethyst: A playful and rebellious warrior who is known for her shapeshifting abilities and uses a whip

More about them:
Pearl: A meticulous, intellectual, and loyal warrior Gem who serves as the team's strategist and historian. Her journey involves learning to find her own identity separate from her former relationship with Pink Diamond.
Amethyst: A chaotic, fun-loving, and powerful warrior Gem whose struggles with her origins and a lack of confidence are central to her character arc.
Garnet: A composed and powerful fusion of the Gems Ruby and Sapphire, representing an "acceptable" fusion in the Gem world and a deep love story.
Other Key Characters
Ruby and Sapphire: The two Gems that form Garnet, their love story is central to the show's narrative and highlights the freedom and power of choosing to be together.
Connie Maheswaran:human best friend, who grows from a reserved girl into a brave warrior and develops her own sense of self-worth despite being a human among powerful magical beings

Steven Universe features characters like the Crystal Gems (Garnet, Amethyst, Pearl) who are powerful warriors with unique abilities, including shapeshifting, weapon manifestation, and fusion. All gems can heal their damage with their gem, but their specific powers and personalities vary greatly depending on their designated gem type, such as the analytical Peridot or the water-controlling Lapis Lazuli. There is also a theory that gems are a form of artificial intelligence or a virus that creates other AIs