When writing a novel, how can a character be developed well, but QUICKLY?

May studied the black and white comic panels. “Oh, my. She looks…anatomically implausible. What is she doing to that poor man? Wait, are those cat ears?”

“You need some tea!”

“Well, maybe if you’d wear more clothes, they wouldn’t feel so cold. Hussy!”

What happens if a parent refuses to let their child be transgender? What happens if the parent tries their hardest not to allow their child to be trans, like flushing every bottle of their trans child's HRT down the toilet?

“From the look of you, if you try to sleep now, you’ll spend the next three hours hanging onto your bed trying to stop the world spinning. Since you’re not going to sleep anyway, you might as well keep me company.”

“Yuuna and the Haunted Hot Springs!” Claire turned the book around.

“I’ll put the kettle on.”

How is the legalization of same-sex marriage impacting societal norms in the USA?

“May! You’re home late! Early, I mean. Well, I mean, it’s early in the morning, but you’re home before I expected. Er, after. Before?”

“Thanks. You’re looking pretty ratty yourself. Have you been in that bathrobe all day?”

May yelped. “Hey! Your feet are cold!”

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“It’s not looking at you.”

“I’m glad my sex life is so entertaining.”

Engaging in conversation that also shows something about their intelligence, personality, wit (or lack thereof); and

How do I convince flat earthers that the earth is round?

“You know what? Never mind,” May said. “I am way, way too drunk to be having this conversation.”

“Yep!” Claire chirped. “There’s this schoolboy, see, and he’s homeless, so he lives in this boarding house that used to be a hot springs bathhouse, which is cheap because it’s haunted, so he decides—”

“You don’t need a cat. You can’t take care of a cat. You can’t take care of a ficus.” Claire flopped on the other side of the sofa and wriggled her feet beneath May.

Why did McLaren hope that the Ferrari pair would pit twice during the Italian Grand Prix?

Create a context between this character and other characters.

“Number one, it’s not porn, it’s ecchi, and number two, why would I waste a perfectly good Saturday doing anything else?” Claire pulled at her tea and sighed. “The only thing that could make this day better is if you'd come home with some cute boy, so that after you kicked him out tomorrow I could live vicariously through you.”

After Eunice and I finished London Under Veil, I entered the first chapter in a contest at a convention where you could submit something and have it critiqued by a professional book agent.

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Here’s how we presented the character Claire when she was introduced, which the agent particularly singled out:

“Nope, I mean a cat followed me home. A black cat, to be exact. All the way from the club. Probably still out there, for all I know.”

They both burst out laughing. “I’m right, though,” Claire went on.

Are democrats inherently stupid or just lazy? They can Google " Ohio is investigating reports by residents that migrants are eating the local wildlife " why can't they seem to do the most simple things? Blind, ignorant, stupid or obtuse?

“I try not to, but thank you for reminding me. I know I don’t need a cat. I don’t want a cat. What would I do with a cat?”

“No way.”

“Claire, I—”

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“Damn straight. So get to it! This time next week, I want to hear some moans coming through that wall.”

The agent had only one bad thing to say (the synopsis was crap; writing synopses is hard!), but praised the characterization and particularly how well we introduced a character’s personality quickly.

“None of those either. Look upon the wasteland that is my sex life, and see that it is barren. Naught but a moggie followed me home.”

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“Hang on, are they playing ping-pong?”

“No, about the cat. You don’t need a cat. You remember what happened to your spider plant, right?”

Claire, one of May’s three flatmates, former university roommate, and best friend in all the world, shrugged expansively. “It’s a Saturday night. What else would I be doing?”

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Essentially, what you do is show the character:

“I’m serious!” Claire said. “It’s staring straight at me.” She let the curtain fall. “Weird.”

“Tart!”

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“Well, maybe if you didn’t spend all day reading—” May prodded the book with its garishly-coloured cover with her foot. “Bizarre comic book porn…”

“Yes way. It’s washing itself under the street light. Uh-oh, I think it spotted me. It knows I’m watching it. I swear it’s looking at me.”

“I’m just a fan of your catch and release program.”

Artists get better with age, e.g., painting. Yet when it comes to pop music, the famous work tends to be written when musicians are in their twenties. So, why aren't Bob Dylan or the Stones banging out amazing tunes now?

“Fine.” May collapsed into the warm spot Claire had just vacated.

“Why is that always your first suggestion? I do not need some tea. It’s three o’clock in the morning! If I have tea, I’ll never get to sleep.”

“Perv.”

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“Cute girls?”

“Exactly.”

“But they’re cold!”

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“I need to do laundry.”

Claire sat back down, legs tucked elegantly beneath her. “You are looking a bit sloppy,” she said, inspecting May through narrowed eyes.

“It’s a cat. All cats are weird.” May sipped from her mug, inhaling the warmth. She closed her eyes. The room spun. She opened them again. “Ugh. I think I drank too much.”

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“They are! He broke the rules of the boarding house by petting this character while she was in cat form, so they invoke the ancient rules of single combat via ping-pong, and—”

In the kitchen, Claire set out a battered pair of mugs: May’s black, with “PEBKAC: Problem Exists Between Keyboard and Chair” in white letters; Claire’s white, with “This must be Thursday. I never could get the hang of Thursdays” in dark blue. She carried both mugs into the living room. “A moggie followed you home? Is this some weird Internet slang I’m not current on?”

“So you didn’t meet any cute boys at the club tonight?” Claire called as she bustled about the small kitchen.

May pushed Claire’s feet away. Claire rose to peer out the window. “Huh. It’s still there.”

Doing something they enjoy, that expresses their personality, and that is in some way unusual or noteworthy;

Do that and you can ground your characters quite quickly.

“About wearing more clothes? How am I supposed to catch any fish if I don’t show off the bait?”

“I know! That’s why I’m putting them under you!”

“Exactly.”

“I don’t know. Partying. Going to a pub. Anything besides sitting on the couch reading…” She squinted. “What the hell are you reading?”

“Nary a cute boy in sight.”

“Claire! Why are you still up?”