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. 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.