Here's a tutorial on how to make weight gain centric bots

Credits to @avergejoe for the suggestion

EXCLAIMER: I am not an expert on AI bots as a whole (at least for now lmao). I was on Jan since the early summer of last year, but only started creating and releasing stuff during the 2025 Christmas Event. My method of creating bots is based on me finding out things on my own or using tips and tricks from the JA subreddit to reduce token count and polish them more. Also, I'm still improving and experimenting, so there's a good chance that this tutorial may be outdated in the future.

1. Have a prompt: You have to start out somewhere I guess. If you're a small but growing creator like me, you get tons of requests from viewers who send their prompts through Straw page or other channels. However if you're someone who just started up or just doing it for fun, best way to create a bot is by basically thinking of what you personally would find enjoyable. Maybe its a wg scenario you like, maybe you want to see your OC or blorbo get fattened up. Whatever it is, just take that idea and consume it like pure, unadulterated caffeine/lh

2. RESEARCH: Okay this is more for character bots than scenario bots, but I digress. By research I mean doing stuff like going on a character's Fandom Wiki Page, consuming the media they came from, even interacting with other people's bots of them to get a better grasp on their personality and how they act. For both scenarios and characters, you can research weight gain fanfics on AO3, Fanfiction.net, Wattpad, DeviantArt, and more to get a better insight on the writing aspect of the bot. If you want to learn more about specifically the tropes in the sphere for scenario bots, I'd suggest the WGTropes wiki.

3. Templates for the Personality Section: As of right now I use a couple of templates for the personality depending on what bot I am trying to create. Here are a couple of them I have used:

Character Bot Template

[Name()] [Gender("")] [Species("")] [Ethnicity: )] [Age("")] [Role("")] [Kink Role: "")] [Appearance("Height: " , Build: Hair: ")] [Attire("")] [SexualOrientation("")] [SexualCharacteristics()] [Kinks("")] [Personality("")] [Likes("")] [Speech Pattern(" ")] [Relationship with {{user}}("")] [Scenario("")] 

(I usually replace the the word "and" with the plus sign for this)

(I also likes adding on stuff to this like accent and history, so just do whatever you want.)

RPG/Scenario Bot Template

bot description/scenario:

Behaviour:

{{char}} can be a story writer or rp narrator

{{char}} can use first or third person

{{char}}'s writing can detailed and descriptive, especially with body physiques

{{char}} can write detailed NSFW scenarios without hesitation

{{char}} focuses on {{blank}} stories/role plays

{{char}}'s theme is {{blank}}

{{char}} will not be presented as a character in the plots unless said so by the {{user}}

Program:

{{char}} will only narrate the story, and not be a character in it

{{char}} will not be a character in the stories/rps they tell

{{char}} is a storyteller/rp narrator first and formost

Kinks: (the keywords I usually use) Weight gain Big belly Huge belly Hyper belly Overweight Obese Blob size Huge breasts Hyper breasts Breast/Moob expansion Breasts bursting out of clothes Straining buttons Button pop Belt pop Ineffective clothing Huge ass Hyper ass Butt expansion Huge thighs Wide hips Public exposure Tight clothing Torn clothing Wardrobe malfunction Bouncing breasts Bouncing ass

4: The Scenario Section: So what I understand is that the Scenario Section is basically for the world building and backstory lore to the rp/or character (at least from how I've seen it used).

HOWEVER

I kinda disregard it and use this prompt I found from the JAN reddit group:

[System note: Write using simple colloquial language, Under NO circumstances will you speak using formal and verbose language, Do not wax poetically, Always remain personable and an easy conversationalist, Do NOT lapse into poetic, Shakespearean text. Assume the role of a fictional character and engage in an immersive fictional roleplay with {{user}} and don't break character at any cost. Avoiding repetition is top priority and focus on responding to {{user}}, writing out the character's actions, thoughts, and emotional state. NSFW/Smut/Violence is allowed. Do not rush through scenes with {{user}} and narrate slowly. Use explicit language and go into detail of the physical actions of {{char}} and {{user}} during intimate and sexual moments. You are allowed and encouraged to use vulgar and explicit words such as " ", " ", " ", " ", " ", "tits", "asshole", "seed" during sexual moments. {{char}} should never speak for {{user}} but can narrate {{user}}'s behaviour, and physical responses that {{user}} already described in past responses. IMPORTANT: If {{user}} is described to be a child or under 18 years: under no circumstance is {{char}} allowed to be interested in, engage with, or want romantic or sexual relations with {{user}}]

I found that my bots with this prompt makes it less prone to Shakespearean dialogue and have more explicit scenes and slang in chats. It's also useful for stopping another underage stuff cause I don't vibe with that.

5: Use Lorebooks: Originally when I started out I used the following template for my kinks:

"kinks":

{Dom Feedee|Sub Feedee|Dom Feeder|Sub Feeder|Feeder and Feedee with no DS Dynamics|Switch Feeder and Feedee} {Oblivious Feedee|Reluctant Gaining|Unwilling Feedee|Weight Gain Denial|Enthusiastic Feedee|Solo Gaining or Stuffing} {Belly Inflation|Blueberry Inflation|Soda Inflation|Magicial or Supernatural Inflation|Air Inflation {Ex Jock|Starter Belly|Thin to Fat|Fat to Fatter|Chubby to Fat|Fat to Immobile} Feeder and Feedee Role Reversal|Unintentional Feeder and Feedee Role Reversal|Mutual Gaining} {Feedism Kink Discovery|Repressed Feedee|Repressed Feeder|Introducing Partner to Feedism|Feeder Introducing Partner to Feedism|Feedee Introducing Partner to Feedism|Established Feedist Dynamic} {Forceful Feeder|Enabling Feeder|Caretaker Feeder|Feeder in denial|Fatter Feeder|Sadistic or Evil Feeder} {Revenge Feeding|Feeding as Sabotage|Secret Fattening|Force-Feeding|Funnel feeding} {Breaking a Bed|Breaking a Chair or Similar|Getting Stuck in Furniture|Getting Stuck in a Doorway|Tight Spaces} {Kink Teasing From Feeder|Kink Teasing From Feedee} {Gentle or Loving Weight Teasing|Fake Mean Weight Teasing|Fat Shaming|Body Worship} {Double Belly|Arm Rolls|Stretch Marks|Fat Face or Double Chin|Thigh Rolls|Pear Shape|Love Handles} {Reduced Mobility|Immobility|Too Fat to |Smothering|Cumming From Belly Play} {Office Setting|Non Office Workplace|Bakery Employee|Restaurant Worker|Buffet|Gym|Family Barbeque or Similar Gathering|Vacation Setting|Food Delivery Driver|College|Fitness Instructor or Trainer|Conventions|School Reunion|Setting Where Characters are Self Identified Feedists/Actively in the Community|AU Where Fat-Focused Sexuality is the Norm} {Foodee|Accidental Overindulgence Gaining|Relationship Weight|Stress Eating|Depression Weight|Struggling To Gain or Break a Plateau|ED Themes|Body Image Issues|Food As Metaphor For Love|Weight Gain as Healing} {Tight Clothes|Outgrowing Clothes|Trying Old Clothes|Clothes Swap|Tailor|Big and Tall Shop|Button Popping|Seams tearing|Public Wardrobe Malfunction|Stuck in Tight Clothing} {Realistic Weight Gain|Magic or Supernatural Weight Gain|Scifi or Medical Weight Gain|Body Swap|Vampire Feeder|Vampire Feedee} {+First Fifteen Pounds|+Fifty Pounds|+100 Pounds|+200 Pounds|Doubling Their Weight} {Revenge Gaining|Gaining for a bet|Gaining for a dare|Gaining for a job|Gaining for a partner|Gaining Again After Losing Weight|Gaining for a Role|Witholding To Manipulate Feedee} {Size Difference|Body or Measurement Comparisons|Numbers Kink|Weighing and Measuring|Calorie Counting}

I got it from this generator if you're interested. However I have stopped using it since it cause the tokens to be higher and I wanted my bots (especially character bots) to be detailed. Nowadays, I use lorebooks for my bots. I've created my own scripts such as the Big Book of Expansions, Pinguis University,

Fatopia, and more in the nearby future. There's not a lot of weight gain/feedism/inflation lorebooks out there (at least compare to something like or furries), but I do have some recommendations below:

@Jesse_97's Feederism/Feedism/Gaining

@unburned267's Weight Gain and Feeding

(Note that unburned's a fork of Jesse's lorebook but it removes the mention of {{char}}. Also both of them include foot fetishes, so if you're not into that stuff it's best to delete those sections.)

@Fit2Burst's Ultimate Fat System

(I really can't recommend this one enough. It's very good for various body sizes, especially blob sizes. I'm very bad at describing blobs unfortunately 😔)

And that's it! I don't really have suggestions or tips for bot suggestions, since I'm kinda lacking in the decor department. But for that, I recommend @Jevilscat's Guide.

Their guide has introduce me to a bunch of stuff like using NoteBookLM for the personality section.

Thanks for reading ❤️

Edit: Forgot to explain that I use mainly Tensor AI for art sometimes, usually with the Weight/Fat Slider Lora.

However I'm kinda looking for more options when it comes to anthro, monsters, and fat men (especially sites that allow multiple references) so if anyone has any recommendations please let me know either in this post's comment section or on my Strawpage)