I'm a Super Mario Bros. 2 Boss Too!
When people look back at Super Mario Bros. 2 a few of things come to mind. Firstly it was secretly just Doki Doki Panic, but with Mario characters. Secondly it's the game that introduced the video game community to the one and only Birdo. Finally it also marks the origin of Shy Guy and Bob-omb, but no gives a damn about them unless we're talking about the Paper Mario games. The curious fact is however is that Bob-omb, Shy Guy, and Birdo are the only characters of Super Mario Bros. 2 to really make appearances in later entries of the Mario franchise. If I'm allowed to be dramatic they are the only characters that are "canon" in the Mario universe. Which is odd considering that the end of Super Mario 2 revealed that the game was all just a dream that Mario had.
Anyways this list looks back at the largely forgotten other bosses of Super Mario 2 and gives them their fair chance to gain mainsteam recognition beyond just Birdo. Personally Super Mario Bros. 2 has a close place in my heart due to the fact that it was the first Mario game I ever beat. Many of these bosses and their patterns are ingrained in my head still to this day.
Oh yeah one last thing. There's a reason why Birdo is the only boss that made the cut into Mario canon...most of the bosses of Super Mario Bros 2 are kid of lame.
P.S. If you wanted to know the Gameboy Advance version of Super Mario Bros. 2, which is the version I actually ended up completing, featured complete voice acting for ALL of the bosses of Super Mario 2...including Birdo. You can listen to it over here, but be warned. The English voice acting is TERRIBLE!