Personality-Customizable LLM Starter Kit

A plug-and-play, lightweight LLM trainer that lets non-ML developers create custom AI personalities or characters for their apps. Trains quickly on free GPU credits with simple configuration. Target: indie hackers, game devs, and app creators wanting AI characters.

Fine-tuning and prompt-based persona customization are converging right now as game devs and vibe-coders flood into AI-augmented app building, and the demand for non-generic AI characters is real and growing. The closest substitutes are Character.ai's developer tools and prompt-engineering wrappers like OpenRouter with system prompts, both of which handle personality without any training overhead — which is the core tension here. The $500–2k/mo band is plausible only as a one-time or low-seat SaaS, since the target audience skews toward free tiers and the value delivered doesn't obviously compound. The biggest risk is that system prompt engineering plus a good base model already solves 90% of this problem for most indie hackers, making actual fine-tuning feel like unnecessary complexity rather than a feature.