Yona

is an inhabitant of Adolla, who is a subordinate of the Evangelist and member of the Knights of the Ashen Flame's Commando Unit.

Appearance
As a shapeshifter, Yona's apprearance changes rather greatly throughout the series. In his human disguised form, he is notable for his supposive artificial looking face, with a sharp chin and nose (which he is able cut paper with). He has long light hair with a distinctive parting sticking out at the front and back, with black hair at the back of his head. His light pupils, resembling an "A" shape or Ouija planchette, which fill his dark eyes. He dons his organization's uniform; a white cloak, and a white jumper with a red cross on the front, as well as white trousers. Later on, his appearance undergoes a dramatic change. Now with blue eyes, his eyes are longer and elf-like while he now has a prominent sharp tooth at the top of his mouth. He wears a crown-like headdress. His uniform has been replaced with a white robe that exposes his neck and upper chest and has a prominent cross motif as they wrap around his body.

In his original form, Yona was an incredibly tall figure with charred skin and shining, jagged and asymmetrical eyes that appear to burn. His limbs were long and skeletally thin. He had shape ears and a noticeably sharp chin. With the coming of the Great Cataclysm, Yona morphs into a bizarre shape, with three eyes that take up the majority of his head. His face is misshapen and elongated with his mouth jutting forward. He has two arm-like tendrils protruding from his waist and a folded fabric-like base instead of legs.

Personality
Yona has a sadistic and twisted personality loyal to the Evangelist. Being the founder of the Holy Sol religion has an obsessive and violent desire for all people of Tokyo to worship the Great Sun God. Expressing great interest in punishing Asakusa for their 'heresy'. He shows no remorse in killing humans and bathing in their blood. He is obsessed with art, viewing the chaos his plans creates as an art form and angrily destroying things that do not suit his tastes. Even killing someone if his facial modifications are imperfect without remorse. Yona has a habit of combining words to express his emotions, using terms such as 'scarious' and 'grudjealous' to express fear and jealousy. In spite of his attitude and his status, Yona is a cowardly individual. Often fleeing at the sight of danger, relying on ambushes and being easily startled. Yona has a very low opinion of humanity and their concept of faith. Seeing their ability to find value in art and narratives, he sees the establishment of a religion as nothing more than nonsense stories designed to control the ignorant. As the truth is slowly revealed, it turns out Yona has done everything in his power to subvert the will of mankind and their genuine beliefs for the sake of his master's will.

Background
On the day that the Great Cataclysm failed, Yona alongside Bugs crossed over from Adolla into the human world. While searching for a human with influence, Yona discovered an unconscious girl, and afterwards, encountered the leader of a caravan who had felt the touch of Adolla. Murdering and posing as Raffles I, Yona brought the girl back to Raffles' caravan in a container, which generated power for the people.

On the orders on the Evangelist, Yona as Raffles established The Holy Sol Temple in order to guide humans to Adolla and create an ideology that would fuel their second attempt at burning the world with The Great Cataclysm. It is believed that he would discover Maki Abe's mysterious pregnancy and placed pressure on local centres by disguising himself as a part of the church. He would be seen over 12 years later monitoring Shinra Kusakabe and feeding rumours and distrust about his family's murder to ensure he could never become a hero or source of hope for the Tokyo Empire.

Abilities
Yona is an immortal being seemingly from Adolla. His abilties are comparable to a Third Generation pyrokinetic, using his Ignition Ability to generate heat from the palms of his hands. He can uses his heated hands to manipulate the blood in a persons face, allowing him to change a persons facial structure via swelling. Using the same process, he can increase the temperature of someone's blood until their face explodes.

Either due to his powers or his unique physiology, Yona can completely change his own appearance and change every aspect of his build. In his original form he was able to impale a human being with a single trust of his arm. He was also able to copy their appearances perfectly and shift around his physical mass to absorb somebody into his body as a way of disposing of their remains or killing them.

Asakusa arc
Two hundred and fifty years later, Yona uses his ignition Ability to change the face of three individuals to pose as Takehisa Hinawa, Akitaru Ōbi and Hikage, indirectly tricking Benimaru into thinking the Special Fire Force Company 8 were enemies. Sometime later within a building, Yona uses his ability to change an individual's face. Dissatisfied with the result, he kills the person in front of his partner. Afterwards, he and two other White-Clad begin attacking Asakusa after sending doppelgängers throughout the town and Company 7 to ensure conflict and delay evacuation attempts. With Haran's fall, Jonah and Arrow departed, and informed Shō Kusakabe of what happened.

Netherworld arc
Upon Company 8 entering the Netherworld in search for the White-Clad, Yona and Mirage use their Ignition Abilities to separate the brigade. The pair follows Takehisa Hinawa into the depths and attempts to disrupt his battle Arrow. As the gunman's battle intensifies, Mirage and Yona are forced to stay at a distance. Once Arrow is defeated, Hinawa is left exhausted, prompting Yona and Mirage to approach him with the intent to kill him while he is helpless. Their plan is foiled by the arrival of Arthur, which causes Yona to retreat as Mirage battles the young knight.

Yona flees the scene and appears to communicate with an unknown person through a radio. He is startled by the arrival of Haumea and the two observe the second battle between Shō and Shinra Kusakabe. Unlike Haumea, Yona is unable to follow the battle due to the use of Fourth Genarational abilities. Once the battle ends and Shinra is impaled with Sho's sword, the rest of Company 8 arrive to protect their comrade from Haumea. While Haumea battles them an earthquake begins to signal that Yona and Haumea must leave, which Yona convicts her they must do.

VS. Holy Sol Temple arc
After Inca Kasugatani joins the White Clad, she is stunned to learn that Yona was responsible for the creation of The Holy Sol Temple two hundred and fifty years ago. Yona confirms the information to her while assuming the shape of Raffles I.

Stigma arc
Yona instructs a White-Clad to find those who have experienced a Adolla Link and to assassinate them. While the murder of Sōichirō Hague is successful, Konro Sagamiya survives.

Ōbi's Rescue arc
Yona appears in this arc.

Stone Pillar Arc
While the White-Clad hold a mass underground, Yona announced to his fellow members that the preparations for the next Great Cataclysm are complete. While Sumire reminded him that it had been two hundred and fifty years since the failure of the Great Disaster, Yona recalled the day it failed and he arrived to the planet.

Battle of Amaterasu arc
Yona morphs into an even more inhuman shape as the Cataclysm draws closer. With the ascension of the final Stone Pillar, the White Hood's pillars disappear from the world and into Adolla. Before leaving Sumire tells Yona that he is being left in charge until the Day of Ruin. With all but the final stage of their plan completed, Ritsu, Giovanni, Dragon and Charon make their way to Amaterasu to insert the key and begin the Cataclysm. Yona stays behind and thinks about Shinra and how his defeat of the Eighth Infernal cements his place as a Devil, completely destroying his potential to be a hero.

Great Cataclysm arc
As the Cataclysm reaches its zenith, Yona is seen standing by Ritsu watching the dark flames cover the world in his human guise. Yona smiles as the second sun is born and humanity's extinction becomes to pass, believing he will finally return to Adolla.

Trivia

 * There are several characters in Fire Force whose names are allusions to or directly taken from both monotheistic and pantheistic religions and notable religious figures.
 * Yona's name derives from the Hebrew: יוֹנָה‎, Yonā, meaning dove or pigeon.
 * He also shares a name with the central figure of the Book of Jonah in the Hebrew Bible who is called upon by God to travel to Nineveh and warn its residents of impending divine wrath.
 * According to his Character Profile:
 * Height: It’s gonna change ♡
 * Weight: It’s gonna change ♡
 * Age: I don’t have anything like that!
 * Birthday: Actually, it’s rude to ask that kind of thing
 * Sign: In a way, I’m like a zodiac sign. I-am-a-Zodiac/The-me-sign.
 * Blood type: Blood can’t fight…it doesn’t make sense
 * Nickname: The "Wondiferous" Artist
 * Self-proclaimed: The Self-Proclaimed "Wondiferous" Artist
 * Favorite foods: This and that of humans
 * Least favorite food: Things without emotion
 * Favorite music: Putting emotion into sound. How wonderful.
 * Favorite animal: A highly intelligent animal. Basically, I suppose it would be a human.
 * Favorite color: The black that mixes with everything and the white that mixes with everything.
 * Favorite type: Everything is only one team
 * Who he respects: Artist people who deserve to be respected
 * Who he hates: Children that are not artists
 * Who he’s afraid of: Scary things are a favorite of mine. Because you get emotional, right?
 * Hobbies: I’m always moved by nature, so I don’t have a hobby
 * Daily routine: Humanly speaking, wherever my instincts take me
 * Dream: Dreams show more than what you see
 * Shoe size: I’ll say it as many times as needed. It’s gonna change ♡
 * Eyesight: I can see a lot of things
 * Favorite subject: I want to be taught a lot of things
 * Least favorite subject: Indeed, until it becomes hated, okay?