From the Super Mario Wiki, the Mario encyclopedia

Konnichi wa! I am Poshi, I'm the huge fan of Mario. We want you to join the club! My new friends call me that, too. Mario is my favorite character, and leader of the Nintendo Crew (the band of heroic characters from Nintendo). Yoshi is the speedy dragon, Pikachu is his partner, Peach is a pretty-pink princess, and pink, blue and green Yoshi kids are the henchmen.