Animation Source Forums

Favorite Bosses:
-Courtney Gears from Ratchet and Clank 3
You get to hit dancing robot chicks with a giganto wrench. What's not to love besides the awesome background music?
-Vigor's Metal Precursor from Jak 3
In betwee fighting it are little animated sequences that get more intense the lower the boss' health gets. His attacks are also amazing as well.
-Pyramid Head from Silent Hill 2
Great Knife action!! Haha!! I just love how he slugs that thing around

The names of the bosses, when clicked, lead to a Youtube video of the boss fight. These do lead to spoilers; stay away if you don't want to be spoiled.

Favorite Bosses:
-Metroid Prime Second Form (Metroid Prime - NGC)
A very fun boss mainly because this is the only time you get t use the ultra powerful Phazon Beam. Plus, the music is a remix of the main theme.

-Andross True Form (Star Fox 64 - N64)
Really, who couldn't like this guy? Sure, he's difficult, but that's where the fun is.

-Ninetails (Okami - PS2)
This shouldn't be much of a surprise... but besides that, just a fun boss overall and the music too the battle adds to the fun as well.

-"The Twin Demons" (Okami - PS2)
An epic battle, this one. Again, Okami makes this battle very memorable with superb music.

-Twinrova (The Legend of Zelda: Ocarina of Time - N64)
I always love dealing with elements, which it why I like this battle.

-Stallord (The Legend of Zelda: Twilight Princess - Wii)
This one is interesting because of the item you have to use, a top-like item called the Spinner. The music is a remake of a former boss battle piece.

-Memiroa: Raems Incarnation (Final Fantasy: Crystal Chronicles - NGC)
A very epic battle. Come on, you, and sometimes three friends, verses Memiroa who is a least 50 times taller than you.

Hated Bosses:
-Savato (Trauma Center: Second Opinion - Wii)
An OK boss but if you don't know what you're doing (like I was) then you'll hate this guy.

-Sin (Head) (Final Fantasy 10 - PS2)
I hate this guy. The main reasons are that he has hight defense and HP and needs to be killed before his Overdrive bar fills (which fills when you attack him).

-Boost Ball Guardian (Metroid Prime 2: Echoes - NGC)
He deals a lot of damage if he hits you and is hard to hit back.


I'm sure there's more for both sections...

I can't exactly think of my favorite bosses right now, but I can say that one of my most hated bosses is one of the Dr. Eggman bosses in Shadow the Hedgehog (I forget which robot though...), due to the fact that while you're fighting him he utters "the more the merrier" like every 2 secounds, which, believe me, can get positively annoying fast. (along with Vector saying "Find the Computer Room" in another level, but that's not a boss)

One of my favorite bosses of all time was the final boss in Legend of Zelda: Wind Waker. Truly, truly epic.

Least favorite? Probably any generic-looking boss who has no real script.

2 favourites are

'Ragnaros' from Molten Core in World of Warcraft

'Bowser' from Super Mario Bros. (Snes)

Have you ever tried beating Sephiroth in the Kingdom Hearts series? I beated him in the 1st but kept losing on KH2, it's like he's been secretly training somewhere +_+

The second I'll mention is Sae Kurosawa from Fatal Frame II, with her one-hit-kills attack base (Crimson clouds included^^, guaranteed to scare the beejeezus out of you ), Sae doesn't say anything when she attacks you, just laughing maniacally and dashing towards you then woops! You're dead, if you don't hold up your camera obscura fast enough to take a fatal frame that is.
Edit: I added this link in case you're wondering what it is, an introduction for Fatal Frame II (Warning: It's a survival horror):
http://www.youtube.com/watch?v=K7Ng3yJIzWs
http://www.youtube.com/watch?v=9czbIFtje3o (English ver)
The girl in the blood-stained kimono is Sae of course.