A Power Trio of girls/women: the innocent child, the steady, wise wife, and the sexual, often sexually predatory seductress.
The wife, the wiser, calmer aspect, is someone around whom one could build a home life. The seductress is sexually experienced and independent. The third, the "child" (who does not have to be a child literally) will be an innocent, perhaps painfully so.
So in short, a triad of:
Their personalities will usually line up with a Freudian Trio: The Seductress represents the Id, The Wife represents the Superego, and The Child represents the Ego.
Similar to but also different from The Hecate Sisters, where both the child and the seductress are replaced with the sexually available but inexperienced maiden, both the sensible wife and the seductress with the fertile mother, and the addition of the bitter crone.
All three character types are considered to be very feminine — with Child representing Light Feminine, Seductress representing Dark Feminine and Wife being in the middle, just like the movie that the trope gets its title from. Instead of Beauty, Brains, and Brawn it's (pretty) Beauty, (pleasant) Beauty, and (provocative) Beauty. Instead of butch, femme, and neither it's (girly) femme, (lady-like) femme, and (womanly) femme.
Not to be confused with the Faces of Evil.
When adding examples, please note that the sexual aspect of the "seductress" must be present, and cannot be replaced with some other characteristic, like "anger" or "strength" or "selfishness". Also note that the second character is wife, not a maternal character, a woman who gives birth or one with any other motherly trait, but one who would make a good life partner. The innocent aspect of the child must be present, not Kids Are Cruel. Please don't put a square peg in a round trope.
Compare The Three Faces of Adam, the not-quite Spear Counterpart.
Lime is youthful in appearence, overly cheerful, and a bit dumb at times, making her the child.
Cherry is extremely domestic and focused on being proper which causes her to appear more even-tempered and less impulsive than Lime or Bloodberry. Often when the other two are running rough-shod over the show's protagonist she is the one to stop and consider his feelings. She fits the wife archtype in addition to really wanting to be the protagonist's wife.
Bloodberry is more shameless than Cherry, and more sexual in her intention. Additionally, the is the only one of the trio with a mature-looking body.
In Saiyuki, personality-wise, Goku is optimistic (especially for a demon), youthful looking, and more than a bit clueless, making him the child. Hakkai is the smartest and most even-tempered, fitting the wife archetype. Gojyo is flirty and physical, making him the seductress, even though all three are male.
Of the three girls who are in love with Kurusu in Daily Life With Monster Girl, Papi is the Child because she is joyous, absent-minded, and a bit naive; Centaurea is the Wife because she is incredibly honorable and chivalrous, as well as unerringly loyal to Kurusu; and Meer is the Seductress because she is very flirtatious, trying to seduce Kurusu on multiple occasions.
In Change 123, Motoko's three alternate personalities follow this mold. Mikiri is the innocent child, Hibiki is the Hot Blooded seductress and Fujiko is the wise, motherly wife.
In some versions of the Legion Of Super-Heroes, Triplicate Girl (or Triad) has a different personality for each body; Triad-Purple is brash and outgoing (seductress), Triad-Orange is shy and quiet (Child) and Triad-Neutral is the stable figure who has to keep the other two together (Wife).
In the DC Universe series Gotham City Sirens, Harley Quinn plays up her clownish persona by acting ditzy and naive (child), Catwoman is pragmatic and sensible (Wife), and Poison Ivy is a vamp known for using her sex appeal to get her way (seductress). They team up.
Heroic Trio has a young ditz, a motherly type, and a (formerly) dark seductress as the main characters.
The Three Faces of Eve is the trope namer here, as Eve, a loyal and dependable housewife, developed two split personalities; first the seductress and then the innocent child.
Twilight has Bella's Naïve Everygirl contrasted with Esme (wife), who warmly welcomes Bella into her home and later restores a cottage on the Cullen estate for Bella and Edward, Rosalie (seductress), who is jealous of Edward's affection for Bella because she the one who has always been desired by men, and Alice (child), who values Bella's safety above all and cares for her like a sister.
In Knots Landing, the three main women fill these roles perfectly: Karen is The Wife, the wiser, calmer aspect. Abby is The Seductress — sexually experienced and independent. Val is The "Child" (although she's the same age as the other women) and is innocent, perhaps to the point of naïveté.
Although all the same age the girls on Friends can be viewed this way, with flirty and sophisticated Rachel as the seductress, innocent and quirky Phoebe as the child and capable, responsible Monica as the wife.
The three women in the study group of Community fit this to a tee:
Shirley is the Wife; she is not only the oldest, she tries to be the voice of reason and mediator wherever possible, as well as the group's moral center.
Britta is the seductress; she has the most varied sex-life and uses sex to get what she wants now and again, she is the most traditionally attractive, and she is the most cynical.
Annie is the child; she is the youngest and the most idealistic and naive, something she often gets made fun of for.
The three female leads of Mad Men: Joan is the seductress, completely capable of using her sexuality to get what she wants. At first glance, Betty (Stepford Smiler housewife) would be the Wife and Peggy (Plucky Office Girl) would be the child, but before long, childishness establishes itself as one of Betty's crucial qualities if not her Fatal Flaw, and Peggy displays a determination to leave behind the role of wide-eyed little girl and becomes a capable woman and Don's equal in a way Betty (his actual wife) never was.
Joan also serves as a maternal role, taking care of business for the younger secretaries and being an excellent confidant for Don, Peggy, and Lane. Even becoming a Mother who would make rather risky decisions for her son's well-being.
The three ladies of The Golden Girls minus Sophia. Rose was the child (sweet and naive), Dorothy was the wife (calm and sensible) and Blanche was the seductress (sexy and fiery.)
The Beautiful People in TNA - Angelina Love the leader was the wife, Madison Rayne the newest member of the group as the child and Velvet Sky was Ms. Fanservice and therefore the seductress. The second incarnation had Madison becoming the wife and Lacey Von Eric as the child while Velvet remained the seductress.
Final Fantasy games in general have a pattern to their three playable females (and there are always three; see the Three Females Rule in the Grand List) are almost always represented as an Innocent Princess type, a Tough but Sexy Type, and a Perky Girl type. Occasionally this overlaps with the faces of Eve archetypes, although often times the Tough but Sexy character is not a seductress but more passively sexy.
Final Fantasy VII has an interesting version of this. For starters, one of the three women is an Optional Party Member, and secondly, the two who weren't looked like they played one role, but in fact were the opposite:
Tifa (looks and acts the part of the seductress) is in fact most reasonable and sensitive — also the secret-keeper of the group (her last name, Lockheart foreshadows this).
Aerith (looks the part of the wife) is in fact boisterous, flirty and street-wise because of her upbringing in the slums.
Yuffie (the optional one) both looks and acts like the child.
Lightning (believe it or not) plays the part of the wife. She's the most motherly and caring of the group — particularly towards Hope and (much later) Snow. She is also said to have acted this way around Serah.
Fang plays the role of the seductress; she is the most flirty and provocative of the group, and is quite Hot Blooded at times. Interestingly, these aspects of her personality originally belonged to Lightning (with Serah as the seventh party member and playing the part of the wife), but when Fang was made a woman, they were given to her instead.
Wife - Aveline is the only character to start the story married (although she is quickly widowed), and the only character almost guaranteed to end in a relationship. She's wise, honest, caring, no-nonsense, and a capable leader; she takes her responsibilities as captain of the city guard seriously and strives very hard to keep the men and women under her as safe as possible.
Seductress - Isabela flirts with everyone and makes no bones about her love of sex and no attempt to hide her past sexual exploits. She is the most provocatively dressed member of the party, and offers to teach Merrill how to do body-shots.
In Knights of the Old Republic. In the sequel, we have the naive Handmaiden as the child, saucy Mira as the seductress, and self-sacrificing Visas as the Wife.
In Super Robot Wars, resident Ms. Fanservice Excellen Browning makes up a group called the "Three Beautiful Sisters", consisting of herself, Viletta Vadim and Lamia Loveless. Lamia is the Child (due to her recent discovery of what it's like to be a human, made more obvious in Original Generations when she gains a Split Personality that sounds like a little girl), Viletta is the Wife (she's the sensible and capable commander of the SRX Team), and Excellen as the Seductress (bloody obvious).
Among Excellen's clones, this trope also applies: Alfimi as the innocent yet Creepy Child, Lemon as the sensible right hand of Vindel Mauser, and Excellen still as the Seductress.
The Highschool Girls team from KOF 2003 had Athena Asamiya as the Wife (more experienced membress, leader of the group, Idol Singer who sings to keep the spirits of her fans high no matter what), Hinako Shinjou as the Child (naive, Spoiled Sweet, a Cute Bruiser who wants to show how girls can do what they wish) and Malin as the Sedductress (Combat Pragmatist, outspoken, veeeeery short Magic Skirt)
Alternatively, in KOF 96 and KOF 97 there are some changes to the Women's Team's roster and they fit in here as well. KOF 96 has KasumiTodoh replacing Yuri as the Child, and in KOF 97 ChizuruKagura becomes a secondary Wife.
In The Legend of Zelda: Oracle Games, the three Oracles (shown in the page image) are Din, an outgoing dancer (seductress); Nayru, a gentle singer (wife); and Farore, a helpful intellectual (child). Unfortunately, the game which was supposed to feature Farore was cancelled. Incidentally, the Oracles share their names with a trio of goddesses in the series mythology (the goddesses of power, wisdom, and courage), but we don't know enough about them to know if they match the trope.
In Fire Emblem there are several all-female Power Trios, but the one that fits in the best is the Pegasus Knight sisters from Fire Emblem 7. The Wife is the eldest sister Fiora (who even tends to be overprotective and strict, middle sister Farina is The Seductress (strongwilled, materialistic, yet with a hidden gentle side) and the Child is little sister Florina (Shrinking Violet)
In the mistresses of Overlord II: Kelda would serve as the child (least evil of the Mistresses and the only one to actually love The Witch-Boy), Juno the seductress (Gold Digger) and Queen Fay is the Wife figure (the one most "Equal" to the Witch-Boy).
The NOL girls of BlazBlue. Noel is shy, innocent and idealistic (the Child), Tsubaki is level-headed and academic (the Wife), and Makoto is the most blatantly fanservicey (the Seductress).
The past arc in the Magic Guild girls too: Caelica the bright younger sister girl, Trinity the sensible, if bookish one, and Nine the fiery and buxom one.