I wrote the descriptions myself, added some of notes that i think fits the characters.
I tried to make spoiler-free descs, but i guess it doesn't seem like it...

LUCY HARRIS

AGE: 19 (Headcanon)
NATIONALITY: English, Irish
FAV. ANIMAL: Cat
ORIGINAL APPEARANCE: MusicalLucy is a young ''lass of the night'', putting on shows at the local "pub" called the Red Rat. She works as a prostitute to support herself and pay the rent. She tries to appear cold and nonchalant, but in reality, she needs love, which she wants to find in Jekyll, but this attempt will turn out to be unsuccessful. Due to her misfortune, Hyde will "take care" of her. Wears a wig for performances, which will be seen in some drawings.

LISA CAREW

AGE: 29 (Headcanon)
NATIONALITY: Cornish
FAV. ANIMAL: Bunny <3
ORIGINAL APPEARANCE: Musical
Lisa Carew (or Emma Alice Margaret Carew now, according to fandom wiki) is the daughter of Sir Danvers Carew, one of the most noble girls in London. Despite her gentleness and politeness, she is contentedly stoic and stubborn. She is the dream of many men, but in the end decides to engage with Dr. Henry Jekyll.

KATE HOLIDAY

AGE: 20 (Canon)
NATIONALITY: English
FAV. ANIMAL: Cat
ORIGINAL APPEARANCE: game (Hyde and Seek)Kate Holiday is a former assistant to Dr. Jekyll who is falsely accused of stealing important reports. To fend off suspicion, she pretends to be a man, making up her alter ego "Kay Seek" (although, the disguise doesn't always work). Shrewd, and also knows how to stand up for herself and her loved ones. Kind-hearted, but also often sarcastic to others. Lives for science, but despite her sharp mind, often pays for her "blunders".

IVY PEARSON

AGE: 31 (Headcanon)
NATIONALITY: Welsh
FAV. ANIMAL: Hound dog
ORIGINAL APPEARANCE: Film (Jekyll and Hyde, 1931)(NOTE: The original character's story is heavily altered, as I wanted to make all characters "unique") Ivy Pearson is a bartender and singer at "the Red Rat", working for Simon as a rapporteur. Dislikes men, including Simon, but is forced to do his bidding to keep her job and extra money. Easily manipulates others, doesn't feel much empathy. Carries knives on her for safety. Allows herself to openly insult patrons of the "pub".

DR. HENRY JEKYLL

AGE: 38 (Non-canonical)
NATIONALITY: Scottish
FAV. ANIMAL: Dove (don't ask)
ORIGINAL APPEARANCE: Book by Robert Louis StevensonHenry Jekyll is a much-respected doctor, chemical scientist, philanthropist, and quite a wealthy man. A friend of Utterson and Lanyon (relations with the latter deteriorated because of the absurdity of Jekyll's theories). Since his youth, he has secretly engaged in wantonness and debauchery. Jekyll finds this dark side a burden and begins experiments designed to separate his good and evil selves from each other. In the course of these experiments, he summons Mr. Hyde into the world, finding a way to transform himself so that he can fully become his "evil" self. Along the way the story of the musical wishes to marry Carew's daughter. Sed to wear shorter hair before the experiment.

EDWARD HYDE

AGE: 38 (Non-canonical)
NATIONALITY: Scottish
FAV. ANIMAL: I'm sorry, but RATS
ORIGINAL APPEARANCE: Book by Robert Louis StevensonEdward Hyde is the "evil side" of Jekyll. A scanty, short man, but dressed decently. He has a nasty and rude character, everyone who sees Hyde thinks he is ugly, but no one can explain why. He's also the one Jekyll signed over the property to. Throughout the story, Jekyll tends to blame all his mistakes on Hyde.

DR. HASTIE LANYON

AGE: 40 (Non-canonical)
NATIONALITY: English
FAV. ANIMAL(insect): Beetle
ORIGINAL APPEARANCE: Book by R.L.S.Hastie Robert Lanyon, a respected London physician in good health, used to be one of Dr. Jekyll's closest friends. The epitome of rationalism, materialism, and skepticism, Lanyon is dismissive of Jekyll's experiments, calling them "unscientific balderdash." He is also a friend of Utterson.

GABRIEL JOHN UTTERSON

AGE: 39 (Non-canonical)
NATIONALITY: Scottish
FAV. ANIMAL: Owl
ORIGINAL APPEARANCE: Book by R.L.S.
Gabriel John Utterson is a prominent and upstanding lawyer, well respected in the London community. Jekyll's and Lanyon's friend, also a distant relative of Enfield. Utterson is reserved, dignified, and perhaps even lacking somewhat in imagination, but he does seem to possess a furtive curiosity. Tries to solve the mystery of Jekyll and Hyde connection.
He would listen to classical music, perhaps Erik Satie.

SIMON STRIDE

AGE: 30 (Headcanon)
NATIONALITY: Scottish
FAV. ANIMAL: Snakes, spiders
ORIGINAL APPEARANCE: Musical
(NOTE: This version of the character is mostly based on 1986 Demo concept.)
Simon Stride ("The Spider") is the recording secretary for St. Jude's Hospital. A self-important, bitter, desperate individual, he believes he was the choice for Miss Carew to pick for a husband, having been her boyfriend when they were younger, and as such despises Dr Henry Jekyll. Two-faced man who tries to appear decent in the public while secretly owning the infamous Red Rat. He's pretty cunning and vile, tries to worsen Jekyll's life and get Emma back. He hides his true intentions from the "elites" behind the polite mask.

RICHARD ENFIELD

AGE: 21 (Headcanon)
NATIONALITY: English
FAV. ANIMAL: Cat or retriever
ORIGINAL APPEARANCE: Book by R.L.S.
(NOTE: this version is based more on the original book rather than the game, but his design is based on the game :D)
Richard Enfield is a distant relative of Atterson. A young man who epitomizes the society of Victorian London. He is not very social (preferring to spend time with Atterson more than with others), can often be irascible and a bit cynical. Despite this, he is fair and tries to help those in need. Lets Atterson know about Hyde's existence.