Most Memorable Boss Fights?

[Pinwheel]

It took me a minute to figure out what this was. When I did, I got a nostalgia rush. Clockwork was a motherfucker. That jetpack fight was fun, but an ass. Ruining him with your cane later on made up for it. Clockla wasn't near as fun in 2.

 

[Ip Man]

Unlimited Ragna in BlazBlue's "Score Attack Mode". Such an asshole, but all the more rewarding when you finally deliver the killing blow.

 

[Marly]

Fluffin' bastard took so long. Maybe I was just weak though. Eh, still, it was long and fun.

 

[BlackEsper]

The Final Battle of The Legend of Zelda: The Wind Waker.

just woah

 

[Square Ninja]

every boss in metal gear solid

 

[Shadow_]

Final Fantasy X with Seymour, and Lady Yunalesca was pretty cool.
I also liked Pokemon Blue with Gary Oak being the champion and everything.