Okay I'm curreently replaying dk64 and omfg I hate Fungi Forest boss so freaking much! What N64 bosses have given you hell?

The Final Boss in Jet Force Gemini.

the final boss in Turok:Dinosaur Hunter (the first on the N64) I felt was nigh impossible, but maybe that is because I often failed to get all of the best pickups and powerful weapons in the game (it can be hard to find them)

  and yes I am aware that there are weapon cheat codes

The HAG 1 from Banjo-Tooie. Could never beat it without that regenerating life 'cheat'.

To be fair, I was really young, but I remember the third world's boss in DK64 being total hell for me. That robot in that cracker jack box, I always felt him coming for me and felt in a hurry. It stressed me so much that I was screwing up all the time.

Then I replayed the game when I was a little older a long time ago, I remember having a hard time against that blow fish boss. (again from dk64)

lol I completely understand man, the third boss is a pain but for me he is more time consuming than difficult. I don't die to him just drop off a lot. The blow fish... I almost lost to him this time around but omfg... the dragonfly round 2 with chunky = worst! I hate it. only the final boss is harder than that... (well maybe creepy castle boss as well)

You mean Mizar? Yeah, he was a pain in the ass.

But I'd say Gruntilda (banjo kazooie) and Hag 1 (banjo tooie) were really hard without cheat codes.

Was about to post exactly this.

gyorg from majora's mask, I personally love the boss but a lot of people seem to have problems with it

which one is that? Is he the first one? Cause up to know I have no idea how I beat him. He just died lol.