What we measured
We pulled aggregate stats from public chat sessions on cosskill to see which personas people actually open, not just which ones look interesting on the browse page.
This is not a huge dataset. As of this writing, we are looking at 264 public sessions. That is enough to see patterns. It is not enough to pretend we have discovered universal laws of human behavior.
Still, the numbers line up with what we hear from people who write in: most practice falls into a few recurring buckets, and the persona someone picks usually tells you what kind of conversation they are trying to survive.
For the bigger framework behind why personas work differently, see the [AI Personas pillar](https://cosskill.com/learn/ai-personas). Below are the slugs worth opening if you want to try the ones other people keep coming back to.
What the top personas were
Here is the current top ten by session count:
| Persona | Sessions | What it suggests | |---------|----------|------------------| | [Musk](https://cosskill.com/persona/musk) | 33 | First-principles teardown, "why does this step exist?" | | [Trump](https://cosskill.com/persona/trump) | 33 | Blunt pushback, dominance framing | | [Jobs](https://cosskill.com/persona/jobs) | 29 | Narrative clarity, pitch tightening | | [Buffett](https://cosskill.com/persona/buffett) | 20 | Money, risk, long-term tradeoffs | | [Ex](https://cosskill.com/persona/ex) | 18 | Breakup texts, closure, boundaries | | [Coworker](https://cosskill.com/persona/coworker) | 12 | Workplace friction, peer conflict | | [Ellis](https://cosskill.com/persona/ellis) | 9 | Cognitive reframing under stress | | [Frankl](https://cosskill.com/persona/frankl) | 9 | Meaning, endurance, hard life calls | | [Rogers](https://cosskill.com/persona/rogers) | 9 | Empathy, being heard without fixing | | [Breakup Recovery](https://cosskill.com/persona/breakup-recovery) | 8 | Processing after the relationship ends |
A few things jump out immediately.
People practice pressure, not politeness
The operator personas lead. [Musk](https://cosskill.com/persona/musk), [Trump](https://cosskill.com/persona/trump), and [Jobs](https://cosskill.com/persona/jobs) are not "nice chat partners." They interrupt. They compress. They ask why your plan deserves to exist.
That matches how people use the product when they are serious about rehearsal. They do not want encouragement first. They want to see where their argument breaks.
If your conversation needs that kind of friction, start there. If you need to slow down and clarify first, [Socrates](https://cosskill.com/persona/socrates) is the opposite move: questions before conclusions, no advice until you can state the point cleanly.
Relationship conversations show up early
[Ex](https://cosskill.com/persona/ex) and [Breakup Recovery](https://cosskill.com/persona/breakup-recovery) both rank high despite being narrower use cases than the operator personas.
That fits the product shape. People often find cosskill when they need to send a message tonight, not when they are planning next quarter's leadership offsite. Breakup and boundary-setting language is high stakes and low rehearsal opportunity. You usually do not get to practice on the person.
So people run the message a few times against a persona that pushes back, then edit until it sounds like them.
Workplace practice is smaller but specific
[Coworker](https://cosskill.com/persona/coworker) is the clearest workplace-native persona in the top ten. Twelve sessions is not massive, but it is meaningful in a mixed catalog.
The pattern we see anecdotally: people are not practicing generic "communication." They are practicing one peer problem.
- credit theft - missed handoffs - tone on Slack - asking for help without sounding incompetent
That is why method personas beat generic chatbots for this use case. "Act like a difficult coworker" is a scenario. "Be helpful" is not.
For salary and negotiation-specific practice, [Negotiate Salary](https://cosskill.com/persona/negotiate-salary) is the closer match even though it did not crack this top ten yet.
Therapy-adjacent personas get used quietly
[Ellis](https://cosskill.com/persona/ellis), [Frankl](https://cosskill.com/persona/frankl), and [Rogers](https://cosskill.com/persona/rogers) sit lower than the loud operator personas, but they keep showing up.
That usually means someone is not trying to win an argument. They are trying to stay regulated while they figure out what to do.
Useful for:
- rumination loops - guilt before a hard decision - conversations where "winning" would actually be the wrong goal
These are not replacements for therapy. They are rehearsal surfaces for language you need before a real talk with a person who matters.
Session depth varies more than we expected
Average message count across sessions is low. Many people open a persona, send one message, and leave.
That could mean curiosity. It could mean they got what they needed in one pass. It could mean the scenario felt awkward and they bounced.
The sessions that go longer tend to cluster around personas that push back hard. That is consistent with what we want: people staying until the wording survives pressure.
If you only send one message, you probably tested an opener. If you send five or six, you are usually negotiating tone after pushback. Both are valid. They are just different jobs.
What this means if you are picking a persona
Do not browse by fame. Browse by the conversation you are avoiding.
- Need to simplify a messy plan? [Musk](https://cosskill.com/persona/musk). - Need to tighten a pitch? [Jobs](https://cosskill.com/persona/jobs). - Need to draft a breakup or boundary message? [Ex](https://cosskill.com/persona/ex). - Need a peer conflict rehearsal? [Coworker](https://cosskill.com/persona/coworker). - Need to figure out what you actually think? [Socrates](https://cosskill.com/persona/socrates). - Need to talk about money with a straight face? [Buffett](https://cosskill.com/persona/buffett).
The [AI Personas pillar](https://cosskill.com/learn/ai-personas) goes deeper on how to switch personas without turning practice into cosplay.