Who is a Boss that gave you a really hard time? (Any game)

Most of the bosses I've fought on the SNES. To be fair though most of those playthroughs were when I first got the system at the tender age of 6 or 7.

the barbarian king of god of war 2 (on titan) :X

Mom from The Binding of Isaac ?

The SHREDDER! (Teenage Mutant Ninja Turles - NES)

Mr Freeze in Arkham City

The last boss from FFXIII. God, those instant deaths.

The last boss in Kung Fu Strike: The Warrior's Rise.

Lance, pokemon red, 1999 gameboy

The only hard boss I can remember right now is the ghost from bioshock infinite ( I don't name it so I don't spoil anyone). In 1999 mode, this boss is a pain in the ass, and you have to defeat it 3 freaking times.

Meta Ridley in Metroid Prime. It took longer to get used to dodging his attacks than the final boss.

Divine Dragoon from The Legend of Dragoon

Most recently, the stupid boss in Chris's Campaign in RE6!!

a boss on a megamen game for the ds, it had a shield and nearly all attacks did no damage to it. I never managed to beat it.

I had trouble with the Clone DLC in Duke Nukem forever. The final boss was so long and difficult. Luckily I died 40~ times on hard playing it through the first time before I went back through on insane and won!

Rollerskate Boss on MGS2 .It was a fat guy with rollerskates and with c4 or something.That guy was pain in the ass untill you figured out wtf to do.

Also the Big Robot On Top of Building Boss from Sideway New York was also annoying and hard.

Bison.

Evrae from Final Fantasy X

I HATE THIS FUCKER

The only boss who I never managed to defeat was Satan himself, at the end of the game Messiah.
Other hard bosses: Kintaro in Mortal Kombat 2, Alisa Bosconovitch in Tekken 6, The final Boss in Rayman 3: Hoodlum Havoc.

Nemesis in Resident Evil 3, but it was when I played RE3 for the first time and didn't knew basic dodges and stuff.

Diablos in Final Fantasy VIII alongside with Ultima Weapon and Omega Weapon. The hardest bosses of FFVIII. Of course now, after around 500-600h of playing FFVIII it's easy-peasy.

I raged on every single boss when I used to play WoW. Reason: stupid people in raid groups and master looters.

Any boss from Shank 2, holy fuck.

Every boss in Bleed.

Well, the first that comes to my mind is quite recent. Fucking Black Dragon Kalameet. I still hate you

I'm not sure what games have to do with this. I'm not going to tell you about any of my bosses though. It's unprofessional. Xb

Ballos (Cave Story)