These are tropes that apply to the characters in How To Hire A Ninja Maid
Kotone Akiko Sonozaki
Mokuba's new bodyguard, Sonozaki may or may not be a magical ninja. With heavier emphasis on the former. She also seems to have about as much personality as a brick.
- Action Girl
- Combat Pragmatist: She does not believe in giving enemies a second chance to cause her problems. If she spots a threat, she'll deal with it as quickly and efficiently as possible. This means she's the only character in-universe who has never dueled anyone. As Amelda finds out the hardest way possible.
- Creepy Monotone
- Defrosting Ice Queen
- Emotionless Girl: Comes off as really creepy to most people.
- Expy: Of KOS-MOS. Or possibly an older version of Rei Ayanami.
- Extreme Doormat
- Disability Immunity: With a chunk of her soul missing, she's immune to most types of magic that target a whole one.
- First Time Feeling: Unsurprisingly, it's protective rage.
- Sugar and Ice Personality: She does have feelings, but only after her soul is repaired. Before then, she struggles with managing them all that well.
- I'm Having Soul Pains
- Important Haircut: Subverted. She doesn't care.
- Mook-Face Turn: Within the context of the story, she originally worked for Hale, who is the one doctored her official records in the first place. Upon regaining a chunk of her soul, the first thing she does is disengage the limiters on her protective instincts and tell Hale to go to hell.
- Mysterious Past
- Ninja Maid: Duh.
- Promotion to Parent: To take care of Setsuna.
- Red Eyes, Take Warning
- Sacrificed Basic Skill for Awesome Training: In her case, social skill for combat skill. And a decent chunk of her soul.
- She's Got Legs
- Stepford Smiler: Someone pulled out all the emotional fiber that's supposed to compose a person. Other than self-preservation and sound tactical planning, she is functionally a puppet during the first six months after the Kaibas hire her.
- The Stoic
- Training from Hell: Courtesy of her father.
- Uncanny Valley Girl
Sonozaki's younger sister, Setsuna is the simultaneously crazier and saner of the two. She also happens to be equal parts Mad Scientist
and Yaoi Fangirl