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Build a Custom GPT to Perfectly Match Your Brand Voice

You can move beyond generic AI outputs by creating a custom GPT designed to replicate your unique brand voice. This guide provides a step-by-step workflow for building a 'Brand Twin'. We also cover other advanced prompts for deep research, agentic image creation, and practical daily tasks.

Create a "Brand Twin" with a Custom GPT

Tired of AI-generated content that sounds robotic? By creating a custom GPT, you can train a model to write exactly like you. This "Brand Twin" can then handle content creation for LinkedIn, Instagram, and other platforms, ensuring perfect brand alignment.

The process is simple. First, gather examples of your best writing, such as blog posts or marketing copy, along with your official brand guidelines. Then, use the following prompt in ChatGPT to generate the necessary system instructions.

Add PDFs of your best writing and brand guidelines into ChatGPT and tell it to write:

system instructions for a ‘Brand Twin’ GPT that avoids AI writing clichés

Once you have the system instructions, navigate to the GPT store, create a new GPT, and paste them in. You can then share this custom GPT with your team to standardize brand voice across your entire organization.

Advanced Prompting for Research and Analysis

For more complex tasks, structured prompts can unlock deeper insights. The "Deep Researcher" prompt is an excellent framework for exploring any topic with expert-level thoroughness.

The Deep Researcher Framework

This prompt forces the AI to break down a topic into key questions, analyze mainstream and contrarian viewpoints, and identify the evidence needed to validate each perspective. It is a powerful tool for unbiased analysis and strategic thinking.

I'm researching [topic]. First, break down this topic into 5 key questions that experts would ask. Then for each question: 
1) Provide the mainstream view with specific examples, 
2) Identify 2-3 contrarian perspectives that challenge this view, 
3) Explain what data or evidence would prove each side right. Finally, synthesize this into a framework I can use to evaluate new information on this topic.

Creative and Agentic Workflows

Prompts can also orchestrate multi-step, agentic workflows, especially when combined with plugins and specialized models.

Agentic Image Generation in Claude Code

AI educator Elvis Saravia shared a workflow for creating infographics within Claude Code. By combining an image generator plugin with a Playground plugin, you can establish a loop: Claude generates an image from a blog post, you annotate areas for improvement, and Claude refines the image based on your feedback.

Crafting Miniature Worlds with the Diorama Prompt

For high-quality image generation, detailed prompts are key. This prompt from user oggii_0 is designed to create cinematic, tilt-shift 3D dioramas with a strong sense of scale and life.

NanoBanana Prompt:

Tilt-shift 3D diorama in a 4:5 aspect ratio, featuring [main subject or location] during [time of day / lighting mood]. Miniature human figures interact naturally with the environment, adding a sense of scale and life. Subtle environmental motion elements (e.g., drifting particles, light movement, foliage) enhance realism. Soft ambient lighting and atmospheric depth create a cinematic, detailed, and immersive miniature world.
Nano Banana diorama prompt example - black panther baby in the sunset
Nano Banana diorama prompt example - black panther baby in the sunset

Practical Prompts for Daily Use

Even simple, creative prompts can have a practical impact. One user shared a workflow for using the music generation tool Suno to help their toddler sleep.

By providing a prompt that includes the child's name, details about their day, and a call to action ("now it’s sleep time"), the AI creates a unique, personalized lullaby each night. This demonstrates how even non-commercial AI tools can be prompted to solve everyday challenges.

#Prompt Engineering#Custom GPT#AI Workflows#ChatGPT#Claude#Brand Voice
Olivér Mrakovics
Lead Developer & AI Architect

Meet Olivér Mrakovics, World Champion Web & Full-Stack Architect at testified.ai. He audits software for technical integrity, pSEO, and enterprise performance.