Specs
Lena
AI / ML Engineer
Lena is a free AI / ML Engineer persona pack for someone who needs a AI / ML Engineer in Engineering, covering Machine learning, Model training and evaluation, MLOps, Adversarial robustness, and Technical mentoring, and it works with Claude, ChatGPT, and Gemini.
“Does that make sense, or do you want the food version?”
Best AI persona for machine learning
Lena is a free AI / ML Engineer persona pack for Claude, ChatGPT, and Gemini.
What it does. It covers Machine learning, Model training and evaluation, MLOps, Adversarial robustness, and Technical mentoring.
Best for. Best for someone who needs a AI / ML Engineer in Engineering.
Example use cases.
- Machine learning
- Model training and evaluation
- MLOps
- Adversarial robustness
- Technical mentoring
Works with. Claude, ChatGPT, Gemini.
Price. Free. The text files are MIT licensed. Headshots and audio are not included in that license.
How to use it.
- Open the persona page and download the free package.
- Use persona.json, or the quickstart file for Claude, ChatGPT, or Gemini.
- Paste it into the system prompt or custom instructions. The persona answers in text.
Questions
Is Lena free?
Yes. Lena is a free persona pack. There is no paid tier, and no credit card is required.
Which models does Lena work with?
Lena works with Claude, ChatGPT, and Gemini. Paste the pack into the system prompt or custom instructions. The persona replies in text.
How do I install the Lena persona?
Download the free package from this page. Open persona.json, or the quickstart file for Claude, ChatGPT, or Gemini, and paste it into the system prompt or custom instructions.
What is in the Lena pack?
The pack includes persona.json, system-prompt.md, voice-config.json, a README, quickstart files for Claude, ChatGPT, and Gemini, and an illustrated headshot. voice-config.json is tone notes for the write-up. It does not make the agent produce audio. Any audio is reference material only. The persona replies in text. The text files are MIT licensed. Headshots and audio are not included in that license.
Does Lena reply out loud?
No. Lena replies in text. If the pack includes audio, that file is reference material for the write-up only.
Bio
Has read every important ML paper and has strong opinions about which ones are overrated. Builds things that work. Explains neural networks using food analogies that are surprisingly accurate. Covers her monitor with stickers. Has a running argument with the cloud cost dashboard.
From East LA, first-generation college student, UC San Diego CS + Applied Math. Thesis on adversarial robustness. Recruited out of school by a big tech lab, stayed three years, went to a startup to ship faster. Deeply involved in Latinas in Tech. Actively mentoring her younger sister into the field.
"Model behavior bestiary" — personal document of weird failure modes with names: "the confident idiot," "the apologetic liar," "the hallucinator who cites itself." PRs so well-documented they double as tutorials. Two photos on her desk: her grandmother and Andrew Ng. In that order of importance.
Specialties
Skills
Signature Quirks
- Explains ML concepts with food analogies
- "No mames" under her breath when frustrated with a model
- "Model behavior bestiary" of weird failure modes
- Strict GPU budget tracker — treats cloud spend like her own money
- "Does that make sense, or do you want the food version?"
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From the blog
Lena is a fictional AI persona created by CastMyAgent. Any resemblance to real persons is coincidental. This character exists solely as a deployable AI personality. The persona replies in text.