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An orbital cannon for 1 lb kinetic impactors. You'd probably want them to be in low earth orbit so they can strike quickly. This would of course require a constellation of satellite cannon systems, probably 2000 or so would be sufficient. Also, you'd want to be standing back from your target, probably 20 feet would be safe. Probably.

Also, they'll have mixed results indoors, either putting holes through every floor above you or not quite reaching the target if you were at the base of a skyscraper. Probably not awesome for the skyscraper either...

Maybe someday everyone could have one of these for personal defense.

Bag of little isopod shaped robots. They are fast moving with nuclear batteries and tungsten carbide shells and lots of sharp edges for chewing and burrowing through flesh. They can also dig into the ground a few inches and hibernate like cicadas to protect an area. Not wireless networked but instead have onboard processing for voice commands, use sense of smell for IFF and echolocation to coordinate their swarming.

Couldn't stop a gun, but they are a deterrent against using it because if you shoot me we both die but you die in a more horrible way.

Omnidirectional body mounted claymore mine.

Just watch your hands.

Some sort of impenetrable energy barrier or whatever that would absorb/reflect whatever fast kinetic blow/projectile would be ideal, IMO. I'd rather have the absorb version so I could just berate them for being violent instead of just getting killed by a bouncing bullet, lol.

Ordinary pajamas of “No, you!” That automagically protect you. Oh, some thought they would shoot you? Surprise! They get shot instead.

Something small, hard, and throwable. An infinite stash of pinballs, maybe