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.
"Favorite" is a strong word, but I really like the caber from Beastmaster.
It looks like something impractical that some artist would draw, but then it turns out it's pretty similar to throwing weapons that certain African tribes used
In the real one the purpose of the shape is to ensure that a sharp part of the weapon always hits your target, IDK if the movie prop would function that way but it certainly evokes the same feeling when I look at it.
The Buster Sword from FF7 is just what a santoku kitchen knife dreams about becoming when it grows up. Chopping onions will never be the same again once you slot in a Mega All materia.
There are a lot of contenders, and I guess my favorite is going to depend on various different categories. But the first one that popped into mind just because I think it's really cool is Fromsoft's recurring moonlight sword. Started in King's Field and then carried on into the Souls series and even Armored Core has an equivalent.
I like it because it's a cool design and also has a cool effect. It's the full package, ya know?
I'd say any fictional iteration of Gáe Bulg because I fucking love mythical spears. I also really like the grotesqueness of the relic weapons in fire emblem three houses.
I get that swords are cooler for a fantasy setting but spears are THE weapon. You put the pointy bit on a long stick so your foolish swore-wiedling opponent can't reach you. Fantasy has neglected the importance of the spear for far too long.
Maces generally were used against armored opponents in medieval warfare afaik, but yeah a flail could break bones or knock someone unconscious or outright kill them with enough force to the head.
It's a club on steroids. A primitive and brutish weapon but undeniably effective. It's like the scientific answer to the cave man "me hit hard" question.
the kirkhammer from Bloodborne is one of my favorites! pretty much all of the weapons in Bloodborne are all-around fantastic but the kirkhammer specifically is the one I had the most fun with and I love it's design
Guild Wars 1 had a lot of unique and weird weapons but the Fiery Dragon Sword is one of those rule of cool weapons even though it makes no sense practically.
I'm partial to absolutely ridiculous weapons like a coffin that shoots bullets or beating someone to a pulp with a literal full sized cross that jesus would've carried. The most unwieldy impractical things possible.
There is a tradition, right across the Multiverse, of macho law-enforcers toting ridiculously heavy sidearms, which surely represent overkill for normal policing duties. Dirty Harry had his .44 Magnum; Detritus carries a siege weapon with a two thousand pound draw.
As Detritus considers this a waste of energy if all the energy devoted to drawing back and cocking the string is only expended on a single arrow (which from a human point of view is a six-foot lance), he has adapted it still further, so that it shoots a bundle of twenty or so arrows bound together around a central core. Due to the violent force acting on them, the arrows tend to disintegrate into a cloud of supersonic (a significant fraction of local lightspeed) shrapnel which bursts into flame from air friction. The resulting fireball scythes everything in its path totally clean. Hence the name. It not only opens front doors, but frequently creates a back door as well.
Pratchett was insanely good at mixing the real and fantastical in both deeply meaningful and very witty ways. There is a reading order of sorts, but you can dive in at just about any book and work out the actual timeline later without ruining the experience.
there are torrent packs out there for both the books and the audiobooks. after another user mentioned it here i've been using the audiobooks to sleep to.
side note but I really enjoyed how the character raelza in this handyman saitou anime has a similar sword to Guts's but it shows a slot on it/her armor that she locks it onto and it's like, nice, they actually show that instead of the sword just being stuck to their back like a magnet
Bleach had (has? I hear it's back on again now) some really great ones. Basically every weapon has multiple forms where it gets cooler and cooler, often culminating in a battlefield filling sentient monster.
Abarai Renji has Zabimaru, a hooked whip sword that transforms into a flying bone dragon.
Kuchiki Byakuya has Senbonzakura, which looks just like a normal katana but its special form scatters into thousands of tiny blades which are only visible as cherry blossom petals blowing in the wind from the light glinting off them.
Ichigo, since he's the protagonist, has an extra special sword that gets smaller instead of bigger in its special form, which concentrates his power and makes him extremely fast and strong. It's normally like Cloud's sword but shrinks down to become like Sephiroth's but all black.
I kinda liked the Galaxy Eater from the 50th anniversary of Doctor Who. The implication was that it had the capacity to erase whole galaxies from time, but it never got used it because it developed a conscious. It judged anyone who tried, manipulating them psychologically and temporally.
Balefire itself is more of a spell than a weapon, but also very cool to have a “weapon” that directly attacks the fabric of reality to remove the targets thread of existence.
Yeah, I guess what I like about it is the fact that it isn't a weapon really, but at the same time winds up being the most powerful weapon against The Dark One in the end, the subversion of expectations for magic swords feels good and well executed there.
the gauntlets in the original Heretic had cool visuals and sound effects, I also liked how the main character from the Seirei no Moribito anime always had her trusty large spear, I recall that show had some nice nature backdrops too btw
That man-portable Gatling gun with an integrated shoulder-fired rocket launcher from the Flash game Combat Instinct 3.
It just has this over-the-top early 2000s sci-fi games feel to it, pay no mind to how unwieldy and cumbersome a weapon like this would actually be, let alone without a futuristic full-body exo suit.