Can be anything from any source, movies, books, comics, video games, manga, anime etc.
Pic related is mine, the dragonslayer from berserk. I like it because it's simple. It's just a big fucking sword, no fancy bells and whistles like enchantments or spells.
Second runner-up is sting from lord of the rings, I like that it glows blue when orcs are around and it can be used in the dark as a light source.
Fukken lightsabers, man
Yeah they're cool but they got so played out unfortunately.
Nah man, they're like vwmb bwmmm PSHYEWWWWWcrrrckhrkhrkhr. Shits dope
Nah for real though, even when Star Wars is tired and shitty, the bits with the light sabers are usually the best part