"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". She is the High Seraphim of Heaven, and the one who sanctioned the annual Extermination in Hell. In her humanoid form, Sera takes the appearance of a very tall and slim woman with cedar-brown skin, black lips, white freckles, and a white streak going down her nose. She also has hip-length, curled hair colored in a silver-like ombre. Her eyes have white irises, blue-gray sclera, dark purple pupils, and dark purple thick eyelashes projecting from them. Atop her lashes are a pair of longer, holographic-like lashes, which are colored in a slightly paler shade of dark purple. Her eyelids are colored like her holographic-like lashes. She also has six feathered wings on her back colored in light periwinkle and white, 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. Sera wears queen-inspired clothing which consists of a two-layered, periwinkle-gray gown with a high-frilled light periwinkle collar, white and periwinkle-gray bouffant sleeves with white detailing, along with most of the bottom and hem colored in a light periwinkle and white with diamond designs around it, Sera is now in heaven in her room