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

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

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

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.

How can I be okay with being ugly? What is the bright side?

“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.”

“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—”

“No way.”

What is it like to wear a kilt?

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

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

Essentially, what you do is show the character:

I gave him everything. He said he loved me. Why?

“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.”

“Claire, I—”

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?”

Why do men think I’m easy just by looking at me?

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.

“But they’re cold!”

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

Mario Kart World wouldn’t be in the running for Game of the Year even if it was perfect - polygon.com

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

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

“You need some tea!”

What if the girl says that drama about you dating here? Is that a bad sign?

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

“Exactly.”

“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.

Has anyone ever worn leather pants? Are they comfortable?

“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.”

“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?”

How is TikTok able to censor porn?

“I’ll put the kettle on.”

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

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

Why are US customs agents so talkative? I cringed hard when a US customs agent asked me if I was on vacation. He doesn’t need to know why I went to another country as long as I am a U.S. citizen.

“I need to do laundry.”

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

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

Why do people believe that global warming is man made?

“Tart!”

“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.”

“It’s not looking at you.”

How do you feel about Donald Trump signing an executive order that says there are only two genders?

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

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?”

“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.”

Why do wokes use words like "homophobes" when they don't know what that means? Do they realize that no one is afraid of them?

“Cute girls?”

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

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?”

How do introverts celebrate their birthday?

“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.”

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

“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—”

What misfortune led to an important discovery?

“Perv.”

Do that and you can ground your characters quite quickly.

“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.”

“Exactly.”

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

“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?”

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

“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?”

“Claire! Why are you still up?”

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

“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…”

Create a context between this character and other characters.

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

“Nary a cute boy in sight.”

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