Sersi

"When you love something, you protect it. It's the most natural thing in the world. You've loved these people since the day we arrived. There's no one better to lead us than you."

- Thena to Sersi

Sersi is the Prime Eternal, and the current leader of Earth's Eternals. Created in the World Forge by Arishem the Judge, she was sent to Earth to protect humanity from the Deviants. While on her mission, she grew a close relationship with fellow Eternal Ikaris and eventually married him. By 2023, centuries after Ikaris left her, she became a history professor at the Natural History Museum, and fell in love with her human colleague Dane Whitman.

After the occurrence of seismic earthquakes shaking the Earth and the resurfacing of the Deviants once again, Sersi, Sprite and Ikaris reassembled the Eternals. Discovering that their leader Ajak was killed in a Deviant attack, she was chosen to be her successor as the Prime Eternal, after which she learned of her true purpose to incite the planet's Emergence and the birth of the Celestial Tiamut. Learning the planet and all humanity would die in the process, Sersi and the Eternals worked together to stop the Emergence, averting Earth's destruction. Disappointed with the sacrifice of Tiamut for mankind, Sersi was abducted alongside Kingo and Phastos by Arishem, so Earth could face judgement.

Creation
Sersi was built and programmed by Arishem the Judge, and presumably was sent to multiple planets to protect and help evolve sentient life forms from the Deviants, powering a Celestial seed inside the planet, which would absorb the energy made from the sentient lifeforms. Eventually, the Emergence would occur, destroying the planet in the process. Upon finishing their mission, the Eternals would be sent back to the World Forge to have their memories erased and reset.

Arriving on Earth
"It's beautiful, isn't it?"

- Sersi to Ikaris

Sersi and the rest of the Eternals were sent to Earth on the Domo. Once awoken, the Eternals were provided with suits to wear before arriving at the planet. Sersi admired the beauty of Earth, and then introduced herself to Ikaris. Not being one of the Eternal's main fighters, Sersi waited as the others fought the Deviants. When the Deviants attacking the humans were defeated, Sersi came down, and the Eternals presented themselves to the race they were assigned to protect.

Marrying Ikaris
To be added

Defeating the Deviants
To be added

Life on Earth
To be added

Return of the Deviants
To be added

Chosen by Ajak
To be added

Reuniting the Eternals
To be added

Learning the Truth
To be added

Ambush at Druig's Compound
To be added

Returning to the Domo
To be added

Ikaris' Betrayal
To be added

Stopping Tiamut
"Tiamut joined our Uni-Mind. We became one, even with Ikaris and Sprite, and that's all because of Tiamut."

- Makkari to Phastos

To be added

Taken by Arishem the Judge
"You have chosen to sacrifice a Celestial for the people of this planet. I will spare them, but your memories will show me if they are worthy to live. And I will return, for judgment."

- Arishem to Sersi

To be added

Personality
"This planet's my home, but I can't pretend to be human anymore."

- Sersi to Dane Whitman

Sersi has an affinity for humanity and had been in love with Ikaris for about 2,500 years before their relationship ended when the Eternals developed conflicting ideals and went their separate ways, but nevertheless helped him recruit the group for one last mission. Sersi has also a great love for humans so she uses her transmutation powers to protect humankind and help to advance.

Powers

 * Eternal Physiology: By design from the Celestials, Sersi is an Eternal possessing superhuman strength, durability, speed, agility, stamina, reflexes, and healing, numerous times superior than any normal human being, as well as immortality and being able to manipulate cosmic energy to a certain degree.
 * Superhuman Strength: Like all Eternals, Sersi possesses great superhuman strength, numerous times stronger than any normal human being.
 * Superhuman Durability: Sersi's body is numerous times more resistant to physical and energy damage than any normal human being. During the battle in the Amazon Rainforest, Sersi was unharmed and experiences no injuries after being knocked aside by the tail of a large Deviant, which sends her flying into a wooden building which is destroyed in the process. She was also stabbed through the stomach with a knife by Sprite in an attempt to stop Sersi from ending the Emergence. Whilst this does initially disable Sersi, she appears to have suffered no repercussions from this injure and she soon joined the Uni-Mind.
 * Superhuman Speed: Sersi can run and move at great superhuman speed, much faster than any normal human being.
 * Superhuman Agility: Sersi naturally possesses far greater agility, equilibrium, flexibility, dexterity, balance, and body coordination than any normal human being. In an attempt to lure a Deviant away from Sprite and Dane Whitman, she jumped over a fence and scaled a wall with relative ease.
 * Superhuman Stamina: Sersi's advanced musculature is considerably more efficient than any normal human being. As a result, her muscles virtually do not produce fatigue toxins during physical activity. Her endurance allows her to exercise her maximum capacity for an extremely long period of time without tiring at all. This is shown during the emergence when Sersi runs for miles towards the active volcano, with lava around her, without any sign of exhaustion from the immense heat around her.
 * Superhuman Reflexes: Sersi can react and dodge objects traveling at high speeds, much quicker than any normal human being.
 * Regenerative Healing Factor: Sersi's metabolism enables her to rapidly regenerate damaged bodily tissue with far greater speed and efficiency than any normal human being.
 * Immortality: As an Eternal, Sersi is genetically able to live forever, without dying due to old age or illnesses.
 * Cosmic Energy Manipulation: By design of the Celestials, all Eternals are genetically capable of using cosmic energy. Each Eternal possesses a unique ability, all derived from the same cosmic power source.
 * Matter Transmutation: Sersi wields the power of matter transmutation, changing the makeup of any non-sentient material she touches. Upon her arrival on Earth, Sersi transformed a rustic knife into a more ornamented one and turned the earth into water to irrigate the plantations in the mountains. Sersi transformed a shield-like artifact into sand to save one of her students. During the fight against Kro in London, Sersi transformed the ground into sand and then returned it to its original form to trap the Deviant and later transformed a bus into rose petals. In the ambush in the, to help Druig fight a Deviant, Sersi transformed first a tree into water and then into ice, making it heavier and dropping it on top of the Deviant. In the same battle, Sersi also transformed a wooden cabin into steel to protect the civilians inside and even a Deviant into a tree, a feat that surprised all of her fellow Eternals, as Sersi was only supposed to be able to transmute non-sentient materials. During Tiamut the Communicator's Emergence, Sersi transformed a volcanic rock into several birds.

Former Powers

 * Celestial Communication: After becoming the new Prime Eternal, Sersi received the Celestial Communication Sphere from Ajak, allowing her to telepathically communicate directly with the Celestials, the architects of existence itself. However, she lost this power after Phastos extract the sphere from her to use it in the Uni-Mind's bracelets.
 * Uni-Mind Energy Manipulation: After connecting with the cosmic energy and mind of the other Eternals, Sersi's powers was increased to the point she was able to transform Tiamut the Communicator, an all-powerful Celestial, into stone. Later, she also transformed Sprite into a normal human with the remaining Uni-Mind energy.
 * Levitation: While created the Uni-Mind, Sersi was levitate into the conjuntion sphere of all cosmic energy of her fellows Eternals and later landed into Tiamut the Communicator.
 * Cosmic Healing: With the Uni-Mind energy, Sersi was able to heal herself from the injury of Sprite's knife.

Abilities

 * Genius-Level Intellect: To be added
 * Expert Combatant: To be added
 * Multilingualism: To be added

Weapons
To be added

Other Equipment

 * Celestial Armor: Sersi donned a green armor, equipped on her by the Domo. The armor was durable enough to withstand multiple blows during the fight with the Deviants.
 * Celestial Communication Sphere: To be added

Vehicles

 * Domo: To be added
 * Kingo's Jet: To be added

Facilities
To be added

Family

 * Ikaris † - Ex-Husband

Allies

 * Ajak † - Former Leader and Predecessor
 * Sprite - Friend and Temporary Enemy
 * Thena
 * Kingo
 * Makkari
 * Phastos
 * Gilgamesh †
 * Druig
 * Dane Whitman - Boyfriend
 * Karun Patel
 * Ben Stoss
 * Jack Stoss
 * † - Acquaintance

Enemies

 * Deviants
 * Kro †
 * Celestials - Creators
 * Arishem the Judge - Former Superior and Kidnapper
 * Tiamut the Communicator † - Victim

Trivia

 * In the comics, Sersi is a member of the Eternals who became a member of the Avengers after Gilgamesh was wounded in battle. In her free time, she usually hangs out with New York's high society.
 * Phastos refers to Sersi as "Sylvia" with his husband Ben: this is a reference to her human alias in the comics, "Sylvia Sersi" that she used while residing in New York.

Behind the Scenes

 * Before Gemma Chan was cast as Sersi, Tatiana Maslany, and  were all considered for the role.
 * Having previously portrayed the ill-fated Minn-Erva in Captain Marvel, Gemma Chan didn't expect to return to the Marvel Cinematic Universe until Kevin Feige approached her while promoting  to play a new character in some further production, which ended up being Sersi in Eternals.
 * Zoe Purdy and Ellette Craddock were stunt doubles for Gemma Chan in the role of Sersi.