I have many favourite bosses:
-Omega Weapon, from FInal fantasy VIII (At Sea Ruins)
This is more of a fun memory to me: My brother had Final Fantasy VIII long long ago, and it's a big fan of the game. When he was my actual age, he sweated like hell to defeat Omega Weapon and take Eden out of him.
Years later, when I bought the virtual version of the game for PS3, I went to that point in the game. You needed Zell to open the door, I had Zell very underleveled, and my brother and a friend of his were watching me go down the stairs to battle the boss, facing monsters all the way. They told me not to use Zell, that it'd be too hard. As a challenge, I told them "I'll defeat it with Zell on my team, in no time", as I said this, I transfered Rinoa's summons and spells to Zell, and headed into the fight with a low-life Squall. Aura upon Squall, and the next move was a Lionheart limit break after taking Eden from him. What my brother took day to defeat in it's day, I took it down in seconds. He then threw a tantrum and headed out of the room, with his friend saying "AAhaha, you're mad, you're mad!". feelsgoodman.jpg
-Nael Deus Darnus, from Final Fantasy XIV
I just can't describe how into the battle I was, like I was living it. The situation, how my partners joined the party, the problems we had during the battle... When we defeated it, it was like one dream became true, that I became a freaking hero.
-Wall of Death, from Final Fantasy VII
We all remember that wall boss, right? I sure do remember it; When I was a child, i'd be pressed on by the pressure of having time to escape the ruins, while a boss would appear before me, attempting to crush me, with 2 of my lowest level characters. I'd freak out everytime it appeared.
-Braska's Final Aeon, from Final Fantasy X
The music during the battle between son and father was just... Glorious.
-Evrae, from Final Fantasy X
You basically had to think this fight wihout the help of Yuna and her glorious Aeons. The boss had a lot of attack power and possibilities to kill the entire party in just a few moves... I still can't remember how much time it took me, maybe months, to kill this boss.