Why You Should Write Your Avatar's Bio in Second Person

This is going to sound like a small thing. It isn't.

The way you write your avatar's bio — the canonical persona description you paste into every prompt — changes how the model treats the character. First-person bios make it sound like a resume. Third-person bios make it sound like a Wikipedia stub. Second-person is the one that actually unlocks consistent character output.

The three voices, side by side

First person: "I'm Jeff. I'm 44, I work remotely, I tell dad jokes, I drink reheated coffee."

Third person: "Jeff is a 44-year-old remote software engineer who tells dad jokes and drinks reheated coffee."

Second person: "You're Jeff. 44, remote software engineer in Montgomery. You tell dad jokes without flagging them. You drink coffee even when it's cold. You say 'every day's a hustle' more than anyone should."

Read those out loud. The third one is the only one that sounds like instructions to be someone. The other two sound like descriptions of someone.

Why it matters

The model isn't summarizing your character — it's playing your character. Second-person framing puts the model in the role. First and third leave the model standing outside the role, narrating from a distance. The output reflects that.

I switched from third-person to second-person about four months ago. The character voice in my outputs got noticeably tighter within the first batch. Not "the AI got smarter" — the AI was already smart. The instructions just stopped asking it to describe a character and started asking it to be one.

The trick that makes it stick

Write the bio in second person and write it in present tense. "You drink coffee" beats "You drank coffee" or "You will drink coffee." Present tense locks the character into the moment of speaking. Past tense makes it sound like a memoir. Future tense makes it sound like a forecast.

The full pattern: You're [name]. You're [age + role]. You [present-tense action]. You [present-tense action]. You'd never [present-tense action].

Five lines. Second person. Present tense. The character will hold across a hundred posts.

One small caveat

If you're writing in a system that has separate "system" and "user" prompts (like the OpenAI API), put the second-person bio in the system slot. Don't put it in the user message. The system slot tells the model "this is what you are." The user slot tells the model "this is what someone said." You want the bio to define the character, not to be a thing the character was told.

Tiny shift. Big difference. Your character will sound like the same guy every time.

— Jeff