I noticed you mention a poll in the other thread... but I thought it was what boss to take out first, not which boss is easiest.
In my case, Chun Li is the easiest boss, but I prefer having the Tropical Hazard to help with the handful of trickier jumps (and in my case, compensate for input freeze) and prefer to farm lives before I go to the more difficult end Stages, so I have a better idea of how many I'll really have for the Boss Fight rematches.
With all the threads I keep making on Mega Man in general, I forgot this board was for an actual Mega Man game, and so when I clicked on this, I was thinking it'd be a poll for all the first bosses in all the X games. I was even going to say the dragon in X4.
I need to actually play Mega Man X Street Fighter.
Everything feels better fresh out of the dryer. Even death would be nicer if it was dryer fresh. -UnitOmega010
My favorite first boss to beat is probably C. Viper for her weapon. Chun-Li is easy, but sadly her weapon is kinda lame. In Mega Man games my first boss tends to be the one with the most practical weapon, or one of the most.