Mummies at the Dinner Table: "Eru no Rakuen [-> side:E ->]" suggests that El has convinced herself that her father is still alive and carries on conversations with his dead body. Though, like so much about Sound Horizon, it's open to interpretation.
The Masked Man / Abyss
Played by: Jimang
"Is that girl my Elys?"
Catch Phrase: Besides the above quote, he's very commonly identified with the line "Zannen datta ne," which probably translates best to "Now that's a shame." That line's appearance in the lyrics of "The Grapevines of Joy and Sadness" leads to the common speculation that Loraine de Saint-Laurent is actually the bride who killed Abyss.
Kick the Dog: In the live performance of El's Scales, at the beginning of the song, he's after money, and he sees two injured people on the street. So does he simply mug them quickly and demand the money? No... he sneaks up behind them and freaking takes one of the injured people's crutches and beats him half to death with it before taking their money. Really, there had to be a slightly less... destructive way of achieving the same ends.
Not Good With Rejection: She is absolutely terrified of being rejected, so when the girl she's fallen in love with rejects her love, she snaps.
Nuns Are Spooky / Nun Too Holy: There's the obvious Death by Woman Scorned, of course, but the fact that she's a lesbian to begin with, as a member of the (presumably) Catholic Church, and confessed (presumably hoping to commence a relationship) goes pretty well against Catholic dogma, even if she hadn't been rejected and gone Psycho Lesbian.
I Wished You Were Dead: At one point, she is so envious of her younger sister that she prays for her death, after which her sister becomes infected with the plague. Feeling guilty, the older sister takes her wish back and her sister recovers ... and then their mother dies.
Knight Templar Big Sister: It's implied that she ends up burning the entire village down as retribution for her sister's death.
My God, What Have I Done?: After her sister becomes ill, she blames herself for it due to having previously wished for her death.
Promotion to Parent: After her mother's death, she plays the role of a mother to her younger sister.
The Unfavourite: She certainly feels like it, but it may not actually be the case.
The album's protagonist. He is actually the soul of a stillborn child, and his curiosity about life and death prompts him to send his two dolls, Violette and Hortense, out into the world to find stories revolving around these subjects.
Convenient Miscarriage: Well, more so "heartbreaking" than "convenient", really, especially after taking certain songs (like "Honoo") into account. It's also what sets the album in motion: Hiver is actually the soul of a stillborn, and his curiosity about life and death, as well as a desire to be born into the world, is what prompts him to send the dolls out to find stories revolving around those subjects.
Fisher King: Hiver in the manga. He's obviously not in our world, but the very little we see of the... mysterious place he stays in seems pretty parallel to winter, what with its emptiness and open space of white. Probably makes some lovely echoes, too.
Dark Is Not Evil: Even though Violette is the one associated with death, she never shows any signs of being any creepier or more amoral than Hortense. In fact, in the song Honoo, she's the one "swaying with joy," while Hortense is the one "wet with sadness." Then again, considering the situation, there may be more than one way to interpret that.
Epiphany Therapy: After Laurencin kills the red-headed Laurant (or slightly before, when he sees the red-headed Laurant, in the manga), he recognizes that his life isn't over yet and finally decides to try to clean himself up and move on with his life.
A Tankard of Moose Urine: In the manga, he complains that the alcohol he drinks is absolutely terrible before downing the glass. It's actually a plot point when at the end of the chapter he drinks wine and he notices that it actually tastes good. It's the first time he's actually drunk for the taste, as opposed to in order to get drunk.
Karmic Death: Moreso in the manga, where he's guilty of a lot more (There's a reason Laurencin wanted to kill him, after all).
The man who ultimately kills the red-headed Laurant in Miezaru Ude. In the manga, he is taken to also be the protagonist of Hiiro no Fuusha, which thus explains his motivation. Most details on him only appear in the manga.
Badass Long Robe: When he's grownup and kills the red-headed Laurant. Not that it takes that much badassery to kill someone drunk to the gills, but still. He did it in a badass fashion.
Distinguishing Mark: A red patch on the back of his neck that appears when blood runs to his head. He hides it for fear that the other kids will see it as a Mark of the Beast - and indeed they do search him for one at the beginning of the manga.
Ill Girl: She's nearly blind and is going to go completely blind.
Meaningful Name: In story. Her mother named her "Etoile", meaning "star" so that her path would always sparkle like the stars. This became something of a bitter joke to her later, since due to her poor eyesight, she's never actually been able to see the stars.
Missing Mom: Her mother is implied to have died, and since Pleut has the same voice as her mom, it's become a common fan theory that her mom was reincarnated as Pleut.
Played by: Jimang
The protagonist of the song "Tenshi no Chōzō". He is a talented and famous sculptor who falls into despair after his wife's death in childbirth.
Good with Numbers: Put this guy together with The Count in a locked room, and we may or not have some serious mathematical breakthroughs, but certainly, everything down to the seconds they'd spent together in that room would be counted.
Amnesiac Lover: He only remembers the feeling that he loved someone and that he also was loved by someone, but the "seven dead princesses" ( with the exception of Elisabeth) tell him that this was only his imagination.
"Until the time I fall to the ground, I will flap my wings like the moonlight."
One of the main characters of Ido e Itaru Mori e Itaru Ido and the protagonist of the song "Kono Semai Torikago no Naka de". She also appears in Märchen as the last of the "seven dead princesses" and the protagonist of the song "Takkei no Seijo".
Determinator: She chooses death over being tied in a loveless marriage.
Ill Girl: Why she was kept holed up in the castle for so long
Only Mostly Dead: The impetus for her mother taking her to Therese was that she all of a sudden took ill to such a degree that almost everyone except her mother thought she was dead. To note the extent to which everyone thought she was dead, in the live performance, one of the servants is shown literally digging her grave. As it turned out, of course, her mother was right.
Nuns Are Spooky: Zigzagged. She was kind and charitable in life, not to mention her animal friends. After her evil mother kills her, however, she wants revenge. The way she enacts her revenge tragedy also paints her like a cross of vengeful ghost and Nature Spirit.
The mother / "Witch"
Played by: MIKI
The antagonist of the song "Kakei no Majo". She represents the deadly sin of Gluttony.
"My prayers aren't heard, and, unable to receive forgiveness, only sins increase in number ..."
Reformed, but Rejected: The narration and the way she feeds Hansel and Gretel implies that she regrets both abandoning her daughter and killing the nun, but it's too late as the nun already manipulates her revenge.
Obsessed with Food: It seems she abandoned her daughter because she's too poor to have food even for just one person and she eats stale bread given by the nun like it's the most delicious thing ever. Her hunger was so bad, she driven mad by it.
Book Dumb: She's pretty simple in a way that she only concerns herself with her day-to-day survival and her knowledge of books limited to fairytale stories. It doesn't stop her from being a pretty potent Deadpan Snarker.
Costumer: Sorry for intruding.
The Country Girl: (whispering) Then leave if you feel intruding.
Cosmic Plaything: Already starved prior, her village destroyed by peasant rebellion gone wrong, sold to faraway city, employed by a verbally abusive landlady, murdered by hanging, and her liver cut and served as cuisine. Illustrate best in this line;
I'm just trying my best to survive, but things never go my way...
Meido: A waiter and it seems she's the one who cook the food in the inn.
Good Colors, Evil Colors: After waking up from her sleep, her previously attractive-described features (white skin like snow, black hair like ebony, lips red like blood) retold intoObviously Evil characteristics (ghostly white skin, hair black like oblivion, lips red like fire).
Lack of Empathy / While Rome Burns: The song's live performance and say she's not this. The same cheerful rock the song is entirely made up of, with usual red lighting of the revenge tragedy and her stepsister's distressed screams going busy in background. Then she taunts and laughs at her stepsister some more...
He Who Fights Monsters: She's the most visible case of cyclical nature of "victim of the sin becomes the sinner"; her father doesn't invite Alte Rose and doesn't want to be blamed, Alte Rose in return curses Sleeping Beauty and smugly gloats against Aprikose's attempt to reverse the curse, and after awakened, Sleeping Beauty flaunts her princess status as an excuse to banish Alte Rose, who then curses Sleeping Beauty again out of damaged pride.
Parental Abandonment: She becomes one; Alte Rose curses her when she was exiled. Though the specific of the curse is unknown, the way she abandons her child after it's born implies her child born with disability.