In the US, you have the XT250 which is 290 pounds wet, low seat, good ground clearance, 2.6 gallons of gas and fuel injected.
It runs great. 70 mph top speed roughly.
The TW200, 280 pounds, with a gearing change, 65 mph top speed roughly, low seat, fat tires.
The Kawasaki KLX 230 and 230s (lower version) 290 pounds, 71/72 mph top speed (speed limited) 6 speed trans, great engine.
2 gallon gas tank (too small).
Honda XR150, 282 pounds, 2.8 gallon gas tank, 65 mph.
Various Euro bikes, generaly expensive, high performance, high maintance.
For street bikes, you had the TU250 ,320 pounds, 3.2 gallons, 70 to 90 mph top speed wind dependant, 80+ mpg fuel injected bullet proof motor, super easy to maintain.
Honda Monkey/Grom, 230 pounds, low seat, 55/60 mph, 120 mpg, more fun you can not have on a bike, street or dirt.
The Royal Enfield Hunter, unsure of the weight but it feels light.
The classic 350, 450 pounds, feels heavy and it is.
Scram411, 420 pounds, feels heavy and it is, but not for a street bike.
We may get the new cb350 and the W250, maybe.