Iggy as well...I think. Is kind of hard to remember the first gaming experience I ever had, but Super Mario World was the one that made the biggest impact at least.

As for final boss...I think it was King K Rool from Donkey Kong Country, but again, the SNES era is pretty foggy in my mind.

Bowser from Mario ofcourse.

Then The Devil in Tekken 2.

The very first boss I really beat was Bombman from the first Megaman game!

Did Berzerk have a boss ? Yeh , maybe that.

I don't have the system anymore, but I have played tons of SNES games on Virtual Console and emulator. I played FF VI for the first time like 5 years ago and it's my 2nd favourite game of all time. I played Link to the Past, DKC 2 and 3, Earthworm Jim, Mega Man X, and many more just "recently".

I was just too small at the time, in fact, the system wasn't even mine, it was my sister's SNES. The only popular games I had were Mario Kart, Super Mario World and Donkey Kong Country, the rest were mostly just stupid kid games

That's why I consider the N64 my "real" first console.

Well I started playing games in the first gen and there weren't any bosses in those games.

I can't think of any bosses on Atari 2600 games either, so I'll have to go with Bowser on Super Mario Bros also.

The first boss I have beat is a bizarre kind of lizard in Snow Bros on the Nes.

This guy.