If you want something simple and concise, you want as few plain numbers as possible. Weight, height, measurements and stuff, obviously. 'Combat' stats/physical prowess too, but that's about it, especially if the intent is to just act as a reference rather than using dice.

In theory you could put abstract stats on stuff like intelligence or charisma/looks too, but there it'd be far more practical and intuitive to have a short description that sums up the relevant aspects (like 'very smart and educated, but poor people skills','not particularly well read, but lots of street smarts', 'very empathetic but also easily tricked because of it', etc).

And same thing with sex, because that too is more of a 'roleplay'/creative element than plain comparing physical numbers, as well as having a bunch of facets that probably can't all be boiled down to a single two-dimensional scale (and if they could, there'D be far too many of them). So again some manner of description would be more useful (both physical and mental/personality traits). (Like 'Still a virgin but quite good at giving blowjobs', 'Very sensitive breasts so quite enjoys giving titfucks', 'Unusually sensitive and tight pussy, thus actually prefers anal', etc)

As for the physical stats, I'd keep it to a few stats on a simple 10-point scale, where 10 is the human maximum (that is, superhumans can go up to 11 and beyond, but there's no way of accurately quantifying those anyways). Something like this (which I just made up off the top of my head, so might not all be the best comparisons, but I think it gets the idea across):
Strength: (1) Frail child to (10) World-class weightlifter
Agility (includes plain movement speed): (1) One-legged cripple to (10) World-class sprinter or martial artist
Endurance (includes sexual stamina): (1) Sickly, anemic child to (10) 'Iron Man' Triathletes
Toughness: (1) Someone with brittle bones disease to (10) Heavyweight boxing champion

Apart from those few numbers I'd say you more so need characteristics for people to fill in with text, rather than 'stats'. I might try to think of what those could look and get back to this then.