I've been thinking of making my own Mario fangame someday and it's gotten me thinking, what makes for a good or challenging boss fight in a Mario game? I've noticed that in a lot of cases, Mario can't harm the bosses he fights unless he either A) waits for the boss to do a specific attack or B)...
Now that the Kirby enemy's hurt and heal is over, it's the bosses turn, now in the Save a Character format!
Low on HP (in danger):
Master Hand/Crazy Hand