User blog comment:Crispycol/Super Smash Bros. Tournament/@comment-24843283-20141008232339/@comment-25129545-20141008234719

Well Mega Man was conceived before than Yoshi, he has his fanbase established when Yoshi came out later on, plus Mega Man's debut was in his own series while Yoshi was in a Mario game, so it took time from him to get his own series.