Sera

"Heaven needs us, Emily. Everyone looks to us and we can't doubt ourselves or worry about the fates of demons when we have our own souls to protect. Please, if you start to question, you could end up like Lucifer. Fallen. I couldn't bear to see you suffer that fate. So, please, let me worry about this, okay?"

- Sera, to Emily about the Extermination against demons in Hell

Sera is a seraphim angel and a supporting antagonist in Hazbin Hotel who made her debut in "Welcome to Heaven".

Humanoid form
In her humanoid form, Sera takes the appearance of a tall and slender woman with cedar-brown skin, white freckles and a white streak going down her nose, and hip-length curled hair colored in a silver-like ombre.

Her eyes are an almond-shape which sported white irises, blue-gray sclera, deep-purple pupils, and deep-purple thick lashes projecting from them. Atop her lashes are a pair of holographic-like lashes, which are colored in a slightly paler shade of deep-purple. She also has six feathered wings which are pale-periwinkle and white on her back, a white halo that is decorated with large crown-like spikes and blue gem-like circles, and a second halo which hovers above the first one.

For attire, Sera wears queen-inspired clothing which consists of a two-layered, periwinkle-gray gown with a high-frilled pale-periwinkle collar, white and periwinkle-gray bouffant sleeves with white detailing, along with most of the bottom and hem colored in a pale-periwinkle and white with diamond designs around it.

Angelic form
In her angelic form, Sera has a slender owl-like body with light skin, straightened gray hair, along with grey sclera, and large dark blue irises. She has six white wings on her back and a very large halo hovering above her head, with a resemblance to a tiara.

She wears a white and gray gown, which has eyes on it. She also has these eyes on her shoulders and wings.

Personality
Sera comes across as a kind, level-headed person who is caring toward those she interacts with and welcoming to even demons such as Charlie and Vaggie. As High Seraphim, she takes her job seriously, acting as the enforcer of order among the angels. This extends to her abiding civil behavior, as she becomes upset when Charlie curses in the court. She holds a preference for negotiation over violence when it comes to conflict, such as when she is willing to hear Charlie out on her plan to resolve the overpopulation crisis in Hell. Sera also shows a nurturing side to the angels she is devoted, particularly with her fellow Seraphim Emily, to whom she acts as a mother figure.

Due to her peaceful nature, Sera greatly disapproves of Adam's juvenile and spiteful tendencies and the more violent and bloodthirsty of Exorcists, such as Lute. This is shown when Sera disapproves of Adam's declaration of targeting the Hazbin Hotel as the first area for him and his Exorcists to slaughter in the next Extermination. Sera deems his actions as uncalled-for and disapproves of Adam's delight and bloodthirst at doing so.

Despite her gentle nature, Sera's firm dedication to stability and willingness to do whatever it takes to protect Heaven from chaos leads her to perform controversial actions. This even motivated her to support Adam's yearly extermination. Her care for the other angels also factors into these decisions, fearing the same outcome that happened to Lucifer would happen to Emily and other angels if they questioned Heaven's methods, going as far as to protect Emily from the truth to ensure her happiness.

Although she was complicit, Sera does express regret and anguish when making such decisions, claiming that creating an extermination to wipe out sinners yearly was a hard decision but was a required action. Furthermore, Sera herself showed numerous times that she greatly empathized with Charlie and her dreams of redeeming Sinners, but ultimately considers it impossible to accomplish, and thus Sera does what she believes is best with what she thinks is possible. This shows that when it comes to upholding the peace, Sera will act by underhanded means to silence questioning the rules to ensure this, even if it goes against what she believes in or ignoring how other angels feel in the matter. This was shown later when Sera ultimately rejected Charlie's proposal to accept rehabilitated souls, even after acknowledging that the rules of redemption were unknown.

Furthermore, despite regretting allowing the Exterminations and her strong sense of responsibility to protect Heaven, Sera has also shown to be somewhat negligent or irresponsible in the direct handling of matters regarding the Extermination event she authorized and takes a passive approach by letting others handle it. This is repeatedly shown when she leaves almost everything regarding the Extermination to Adam and Lute, and does not get into the details of what exactly it is they are doing and largely leaves them to their own devices. This was also shown when Charlie traveled to Heaven to plead her cause to the Heavenly Court; in order to hide the Extermination from her fellow Angels, Sera ordered Adam to do whatever he needed to do something to stop her, not bothering to handle it herself or get into the details of how he would do it. Her lack of control over her subordinates inevitably leads to Adam accidentally revealing the truth of the event to the rest of the members of the Court while spitting at Charlie, despite Sera warning him.

It is implied during the court trial in "Welcome to Heaven" that Sera does not believe it is possible for Sinners to be redeemed and ascend into Heaven, and at the climax of the trial declared that there was not sufficient evidence to back up Charlie's case that Sinners could be redeemed. Later, in "The Show Must Go On", when seeing Sir Pentious becoming an Angel and being let into Heaven, Sera is visibly shocked.

Abilities

 * Angelic power - Being a High Seraphim, she has powerful angelic power.
 * Flight - As an Angel, she has wings that are capable of flight.
 * Levitation - Sera can be seen always levitating.
 * Teleportation - Sera can teleport herself and others to any location she wishes by covering them with her wings.

Skillset

 * Musical talent - She is adept at singing.

Trivia

 * Sera's name may be a shortening of the type of angel she is, a Seraphim.
 * Her name could also be a reference to, an angel mentioned in the Apocryphal Book of Enoch who is also said to be the highest-ranking member of the Seraphim.
 * Her design is very reminiscent of Adina from the Zoophobia webcomic which was supposed to appear in the scrapped "Angels & Demons" arc.