Aine Yukimura / Ookuchi
- Break the Cutie: The world and the universe seem to conspire to break the poor girl's mind and heart.
- Covert Pervert: Judging by her steamy song lyrics.
- Cute Bookworm - Teen Genius: Gifted songwriter at age 17, though she's mostly average in the rest.
- Demoted to Extra: In the anime. She appeared only in the second season!
- Earn Your Happy Ending: In the "Where Are They Now?" Epilogue, she is Happily Married to a somewhat more mellow and mature Sakuya and has become a mom to their son Shion.
- Na´ve Everygirl
- Rape as Drama: In the manga, she's raped by a high-ranked executive who had a beef against Sakuya. Poor girl nearly splinters mentally after that.
- Shrinking Violet: More in the manga than the anime, though.
- Bare Your Midriff: Everyone goes through it, but Sakuya gets more points since he actually wears this from the beginning.
- Bastard Boyfriend: Moreso in the manga, but in the anime he has his moments too. He's a Type 2: "Troubled, but Cute dude with a Dark and Troubled Past and an even worse current attitude"
- Broken Ace: He excels at anything he puts his mind into, whether it's music, acting, business, sports or modelling. At the same time, he is seriously screwed up.
- Berserk Button: Don't do anything that hurts Aine, he will find you and do everything in his power to make you pay.
- But Not Too Foreign: Half-American. The only traits that reveal his American ancestry are his blue eyes and large frame.
- Child by Rape: Ralph's father raped Sakuya's mother, then Sakuya was born from it.
- Compensated Dating: Did that ever since he was in his late teens. The manga takes it further, making him a straightforward High Class Call Boy. This is how he met Ayako Sakura, actually.
- Enforced Method Acting: During the filming of the movie starring him and Ayako Sakura, Sakuya is injured while protecting Aine from falling props in an accident caused by Ayako Sakura's secretary (under Ayako's orders). His injury is then written (by his urging) into the scene where he shows up drunk at Ayako's character's home, with the film crew agreeing that the scene is better than how it was originally written.
- Financial Abuse: Was adopted and raised by Reiko's manager after her death, but mostly because said manager saw that Sakuya had inherited his mother's musical talents and wanted to use the kid to Work Off the Debt that Reiko left before dying.
- Jail Bait: A rare male example. Had sex with Ayako Sakura for the first time when she was 20 and he was 12, which would make her a sex offender. In her defense, she genuinely thought that he was much older than he really was at the time.
- Jerk with a Heart of Gold: Despite his attitude, you have to admit that he can, and become one, showing how caring and loving he can be to those close to him, especially Aine.
- Tall, Dark and Snarky
- Troubled, but Cute
- Used to Be a Sweet Kid: If the flashbacks to his Dark and Troubled Past are indication.
Voiced by: Chiyoko Kawashima (TV series)
- Alcoholic Parent
- Broken Bird
- Hot Mom: Sakuya's
- Lady Drunk
- Missing Mom: Died when Sakuya was as much 12 years old
- Parental Neglect: Heavily neglected Sakuya when drunk. Which was, like, half the time. (The other half, Reiko cheerfully played her piano and taught Sakuya to sing and play.)
- Rape as Backstory: Was raped by Ralph's father, and that completely destroyed her mind. The consequences made it worse.
Yoshihiko "Santa" Nagai
- Fiery Redhead
- Flat Character: He never really got a plotline for himself and all. He does get a little more development in the anime, which shows why he and Yuki let their former band.
- Walking the Earth: In the manga, after Aucifer is disbanded he begins travelling alone to fulfill his own interests. Appaently, his published travel journals became pretty popular.
Kazuto "Towa" Sakuma
- Big Brother Mentor: Specially to Atsuro
- Dude Looks Like a Lady: And HOW.
- Even the Guys Want Him: Has many fanboys, though he's not very thrilled by that.
- Long-Haired Pretty Boy
- The Quiet One
- Pretty Boy: Yup. In the manga epilogue, he becomes a world-class model and beauty consultant.
- Raised as the Opposite Gender: Implied in other materials. The Sakumas had already several boys and were desperate for a little girl, so they dressed up their youngest son as a girl.
- Wholesome Crossdresser: Almost always dresses in female clothes.
Yukifumi "Yuki" Todou
- The Dutiful Son: Refuses to take over the family's tradition of Noh performing. He only relents when Aucifer is disbanded.
- Only Sane Man: The most mature of the group alongside Towa.
- Tall Darkand Handsome
- Beware the Nice Ones: Please don't hurt his dear sister's feelings. Did you hear that, Riri?
- Flirty Stepsiblings: With Yuka, in the manga. Quite toned down in the anime.
- Nice Guy
Voiced by: Tomoko Ishimura
- Ascended Extra: Got more spotlight in the anime.
- Cool Big Sis
- Flirty Stepsiblings: With Atsuro, in the manga.
- Plucky Girl
- Tsundere: A type B, sweet and cheery until her buttons are pressed.
Voiced by: Nobuo Tobita
- Corrupt Corporate Executive
- Long Lost Sibling: He and Sakuya are paternal half-brothers. Ralph is basically Sakuya were Sakuya fully American.
- Cannot Spit It Out: She and Towa.
- I'm Not Pretty: She thinks she's not as beautiful as other women, despite being quite lovely in both looks and personality.
- Masculine Girl, Feminine Boy: She and Towa, too. In fact she's a beautician and created his trademark super feminine looks.
- Bitch in Sheep's Clothing
- Clingy Jealous Girl
- Idol Singer
- Manipulative Bitch: She finds out by accident about Atsuro and Yuka, then she blackmails Atsuro into making a very saucy report for the paparazzi under threats of spilling the beans out. Had she not gloated about it in front of Yuka, tho....
Voiced by: Misa Watanabe
- First Love: Sakuya's. And she's still carrying a torch for him five years later.
- The Ojou
- Teen Idol: A popular dorama actress
- Adorably Precocious Child
- Cheerful Child
- Spoiled Sweet: A very, very well-mannered and cute little boy
Voiced by: Masako Katsuki
- Canon Foreigner: Created for the anime
- Compensated Dating: She's the one who hires Sakuya for dates.
- Rich Bitch
- Tall, Dark and Snarky: A female version. Her and Sakuya's dialogues soometimes veer into Snark-to-Snark Combat.
Voiced by: Rio Natsuki
- Name's the Same: With Tomoyuki's younger sister.
- Your Cheating Heart: Since Santa paid little attention to her, Yumi felt neglected and cheated on him with another bandmate, which caused the band to break up.
- But Not Too Foreign: Is one-quarter American through his father Sakuya, who is Half-American. Like his father, he too has blue eyes.
- Cheerful Child: His childhood is much happier than his father's childhood was.
- Friend to All Living Things: Is first shown trying to keep some flowers in the garden from withering.
- Precocious Crush: Has one for his kindergarten teacher Miss Jennifer.
- Third-Person Person: Keeps referring to himself by his name because of his young age.