What are some of the WORST bosses you have ever encountered in games?

all the gimmick bosses in any game.(parry/perfect guard/perfect dodge/etc... required to beat it)

I really disliked Doom Eternal Ancient Gods Part 2 final boss. The stop and wait design was antithetical to everything the combat was building to during the entire game.

Worst, as in stupidly difficult? Darkeater Midir and The Nameless King in Dark Souls 3 come to mind.

Evoland Legendary Edition = Shadow Kuro.

Not necessarily the hardest, but it requires really quick movements to beat, so I can't do it. Gives me pains in my wrists due to an old repetitive strain injury. Not worth it, and the reason I never completed the game. lol.

Easy. The final boss fight in Quantum Break and it's not even close. Horrendous design with unfair one-shot mechanics.
Great game set in an interesting universe, but completely ruined by that fight bc all I remember now is the many hours I was stuck there.

Dark Force from Phantasy Star 2, simply because he has a gimmick to where he can scare a party member which gives them a set few debuffs, one of which being the inability to move. There's nothing you can do to prevent this unlike a boss in the previous game, and he can do it to all 4 party members at any time. All you can do is hope the game decides the Nei Sword dispels the fear, otherwise you can hold that game over. He's the only boss/enemy like this in the whole game btw.
As an honorable mention, the final boss of The Incredible Hulk. Enough said.

The boss at the end of Sonic Generations is pretty frustrating and gimmicky. I love a lot about the rest of the game, but oof, the mechanics for flying and dashing and running boss hits.

"Watch out Sonic!"

Probably the worst was Cutie the Elephant from It Takes Two, but not because of the difficulty.

View attached image.

I believe it was Deathstroke in Batman: Arkham Origins for which I needed to watch a video tutorial - and even then it took me 5 more attempts before I could kill him. I didn't even play in hard mode or anything...

Gareth from Octopath Traveler comes to mind.

Kale from Hi-Fi Rush, but it is probably more of my skill issue since I suck at rythm

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Sigrun - God of War
Svipdagr The Cold & Sisters of Illska in GoW: Ragnarok.
Sephiroth in Kingdom Hearts
Took me a few hours, and contributed to a slightly small hole in my coffee table. XD

There was some boss in Deus Ex: Human Revolution that was impossible to beat if you went full stealth earlier – until they patched it.
Also The Radiance from Hollow Knight was frustrating and The Hollow Knight (boss) was just boring to replay to get to The Radiance.
Also, the infamous Mafia 1 race was a nightmare boss :P
The last boss in Monster Sanctuary was impossible to beat with the monsters I've had and I didn't want to spend hours on grinding – so I've never finished the game.

Master Gee in Borderlands 2
On uvhm op10 that guy was fucking annoying

Everyone will kill me for this, but i will say it.
Ghostrunner 2.
Theres six bosses (Counting Avatar and Rahu.) and THREE are just run around, parry, hit, run around.
Honestly the worst one here is Mitra, the final boss that was build up for SO long with the bit of lore and dropping "This dude is about to kill us all" all the time to a point where it gets annoying.
Why? They basically just copied Ahriman (Boss 1, which the fast paced "blade vs blade" combat was actually VERY good) and slapped on an invisiblity power that the ONLY thing you gotta do is look benhind you and parry him. Not to say the fight is SUPER tedious and long for no reason, absolutely filled with theese scenes that when you hit Mitra, you are teleported to a platforming section and then hit him when you reach the platform he is shooting the lasers from. They do take a while and needs a lot of precision, not to say since this game is a "hardcore slasher", MITRA BARELY HAS CHECKPOINTS AND YOU DIE A LOT, FORCED TO EVEN GO BACK TO THE WHOLE FIGHT! WHY??

Good luck on that quest tho.

The Endboss in Mass Effect. Yk Maraudor Shields. On Insanity.
I just... I'll never get over that one.

NES - Mike Tyson in Mike Tyson's punchout was absolutely impossible back in the day. I know it's sort of been trivialized at this point, but before the internet it was horrible.

Somebody gifted me "River City Girls" on last Christmas here and I can't believe this fashion girl boss called "Hibari" is giving me so much trouble that I have lost some interest for the game. Not even "Serperis" or the lady behind the bone collector in Blasphemous made me feel this frustrated. I just can't find the way and feels my character is underpowered compared to her.

From Broken Sword: The Goat.

I hear the ladder from MGS3 is a very divisive one too -- some people love it, some people loathe it.

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• Mr Tomassi from Control I really disliked it, it's an optional boss you have to do to complete a side quest. The worst fight for me in the game, by far.
• Any boss fight from Wanted: Dead (extremely unfair, all of them, you are 1 person and you fight literal tanks, mechs and super soldiers that can one shot you).