The last thing they said. I'll never have to say "What?" 4 times in a row again.

Time left to live. There's plenty of useful things that tell you more about a person, but shinigami eyes would let you save lives and know it, even if no one else does

And if it turns out the number can't be changed through your actions, that would tell you a lot. If nothing else, you could say goodbye to loved ones and get incredibly rich by finding a CEO about to run out of time

Human or Not Human

None. Someday, some company will build and sell a tool that actually does that, and it will be hella privacy invasive. Actually, it'll probably just be another invasive feature added to the Ray Ban perv glasses.

Lies per hour

Fucks left to give.

Basically, how many spoons someone has left, or how much bad and/or taxing stuff they're capable of bearing today.

This would serve two purposes. One. It'd allow me to communicate more carefully or gently with those who require it, two, it'd give me real time feedback on shit I might've doing that's causing a disproportionate amount of harm to someone else.

Ex: I can be in a wonderful mood and capable of taking all kinds of bad news, but asking me to go out of my way to do an act of service for someone else as a show of affection while I'm in the middle of some self-care after I've spent all day working in a service industry will tank my remaining fucks immediately. I'm absolutely certain that others around me have similar reactions to things that I do, and if I could see what they were, I could stop doing them inadvertently.

An icon to indicate if they washed their hands after the last time they used the bathroom.

A scale of 1-10 at how likely we could be friends.

Number of cumulative years they would be imprisoned for, had they been caught and convicted of every single crime they ever committed.

I'm betting most adults are not at zero.

Healthbar.

"Hey, fuck you! I'm gonna kick your ass, man!"

"Mighty big talk for someone who only has 4hp."

Asshole ratio: 0 % = best person in the world.
100 % = worst person in the world.

Computed as an average of bad "actions" with respect to all actions.

Good and bad evaluated with respect to proven positive impact on people's lifes and the planet.

Times they told the truth.

If it's objective truth, sweet! Motherload I can asking anyone the a question to the secrets of the universe and know whether they're wild guess was true!

If it's subjective truth, also useful, but you know just lies or ignorance detector

I'm here to toot for the "lifetime farts" number

moralistic integrity in comparison to social norms.

it's basically a good vs evil bar.

A boolean indicating if they want a conversation or not

Number of days since they finished reading a book.

Some kind of "empathy score." Not sure what the formula would be, but it would reflect how readily they feel empathy for another person, and how many other people they can care about.

A narcissist would have a 0 -- they can only care about themself. Someone with very limited empathy would have a small number -- say, they can only care about their immediate family, and they need to really get to know someone before they care about that person. People who naturally care about others, even if they don't know the other person, would have high numbers.

This number would sometimes just flat out tell you that certain people should be avoided, or certain conversations are pointless with that person. Or if you do need to try to convince them of something, the number may show you how to frame the conversation. E.g., show how it's in their own interest if they have a low number.

Their name.

Number of times they've lied

A percentage of how much our core values/morals/beliefs align, weighted by how important they are to us.

It would make it super easy to know upfront who I should include in my life and who I shouldnt.

You could cheese this by picking a statistic for something like "likelihood to agree if asked for a favor". I'm not going to stress over the wording on how to make it most useful, but something like that could be interesting.

Or something like "amount of undiagnosed cancers" if you want to save people.

How willing they are to talk to you right now. You can always pick the right person to talk to if you need to ask a question, give a friend the exact amount of space they need if they’re going thru something, and easily identify people that are interested in you (or not). Best of all, though, you can spot someone who’s a little too eager to talk and avoid a hostage-style conversation where they won’t let you leave politely

Their net benefit (or harm) to humanity; measured in QALYs.

A generalization on the crimes score, but it also tells me who to befriend. I'm not a utilitarian, but it still seems like helpful data.

Total net worth. No hidden assets or secret bank accounts. Every last cent that a person is worth. Also, it gets brighter/more noticeable whenever you're advocating for something that increases your net worth.

I feel like this would be the only way to get a lot of people to connect the dots.

Quality of Life impact: How much damage (or benefit) their actions (work, lifestyle, whatever) have done for the net quality of life across the globe. I figure anyone who drives to work is probably doing a little more harm than good, but perhaps they make up for it by being a good school teacher or something, whereas AI coders might make things worse ... but mostly I'd like to see if ANY world leaders score in the positive.

I just want a music player indicator to see what they are listening to without have to listen to their music. What they listen to can be pretty telling.

Would be magic if I could press pause as well, for the people without headphones on the train.

lifetime number of orgasms

Number of farts in their lives.

Limit underbreak brave quotient

KDR

Threat level.