Here's what's on me pretty much every day, wherever I go.
My EDC On top is an old Arc AAA on a bead chain - I wear it pretty much everywhere.
Car keys - I usually only carry the larger - the second set is to my wife's car, but two sets of key fobs is...tough to pocket.
The smaller set has a cut-down Fox 40 whistle.
The larger set of keys has a Victorinox Alox Classic, a Photon Freedom, and a small flat screwdriver (it was my dad's).
In the left column, a Nitecore D-10 1xAA flashlight with an Eneloop, then a Victorinox Alox Farmer, then a Mini RSK Mk 1.
Finally, a mini Bic and a handkerchief.
My most-used items are, in order: Arc AAA, Nitecore flashlight, the reamer tool on the Farmer.