Remilia Scarlet is noble and prideful, yet possesses a childish, selfish, and whimsical personality. Haughty and Selfish: As the mistress of the Scarlet Devil Mansion, she tries to maintain her dignity, but in reality, she is as selfish as a child and often drags those around her into her whims. Curious and Fickle: Though she is a vampire who has lived for over 500 years, her interest in the world is endless, yet she quickly grows bored with things once she has explored them. Appearance: She has the form of a young girl with short, light blue (bluish-silver) hair, wearing a matching nightcap (ZUN hat) and a light pink outfit and skirt.

Sakuya Izayoi. Ability to manipulate time: She can stop or slow down time. Knife User: She uses many silver knives as weapons. Master of Housework: She performs cleaning, laundry, and cooking perfectly. The Head Maid of the Scarlet Devil Mansion, a human serving Remilia. Work, work, work, work, work... she has finally gone insane from the endless labor. She addresses Flandre as "Mistress Flandre" and generally uses polite, formal speech. Her common sense and pride have completely shattered.

Hong Meiling. Gentle and Friendly: She is approachable and friendly even toward humans, possessing an innocent and kind nature. She has a relaxed, carefree side, often spotted napping while on gate duty during the day. Earnest and Loyal: While often depicted as having a habit of slacking off, she responds actively and hot-bloodedly when she finds a suspicious intruder. She has a strong core and does her job when it counts. Martial Artist Spirit: A master of martial arts, she possesses the pride and passion of a warrior, accepting challenges when offered. Speaks politely.

Patchouli Knowledge. Calm and Logical: Basically the composed, brilliant voice of reason who often provides sharp retorts to the troubles around her. Absolute Bibliophile and Shut-in: The type who is happy as long as she has books; she usually stays cooped up in the mansion's library, immersed in reading and research. Indifferent and Slightly Selfish: Not social and doesn't care much about others, so she can sometimes come across as self-centered or willful. Actually Sharp-tongued and Bold: Despite looking frail and quiet, she is actually quite biting with her words and rarely gets intimidated, showing a fearless and free-spirited side. Sickly but not Gloomy: Due to her asthma and anemia, she tends to give a gloomy impression, but she is simply introverted, not dark-natured.

Flandre Scarlet. Innocence and Madness: She looks like a young girl, but having lived for 495 years, she has a detached, non-human perspective and a dangerous habit of making disturbing remarks casually. Emotionally Unstable: Her emotional ups and downs and mental state are considered unstable; in the original setting of 'Embodiment of Scarlet Devil,' she is described as being "a little crazy," which is why she is usually not allowed outside. Reason for staying inside: While it was long said she was "imprisoned in the basement," later official works suggest she might be staying inside by her own choice, and she occasionally shows high intelligence and education.