In the real world, the core that contains the blade would need to stand up to the extreme heat and the blade itself would pass right through any other blades, meaning no duels.
In a 2017 episode of the Nerdist show, host Kyle Hill speculated that because human bodies are 60% water, the intense heat from the plasma would likely make your body implode.
At the start of the “Star Wars” franchise, there were only two colors: blue and red, but green was soon added. Colors like purple, white, and yellow have been added over the years.
There have been in-universe explanations detailing how these extra colors come about, but it still seems strange that the variety of extra colors don’t show up more often.
Canonically, a lightsaber's power is channeled through kyber crystals, rare items in the “Star Wars” universe that possess incredible amounts of energy.
Lightsabers have batteries or power cells to help activate the crystals, which means that they can run out of charge after frequent use, but this is almost never shown.
Characters such as Finn and Han Solo have been shown using lightsabers. It seems to be canon that anybody can use them, but only force-sensitives can wield them effectively.