I must say that my favorite Kirby form is a tossup between Bomb and Jet. On one hand, as Jet you are nigh-indestructible in a fully charged attack, allowing for avoiding opponent's attacks easier than ever. It also allows you to go across the screen. The shuttle loop can kill three bosses in one move, and in general it is very powerful. Also, Kirby wears a jet on his head, what is cooler than that? On the other hand, bomb is made of explosions, and appears in more games. Practically all of its combinations in Kirby 64 are great, and in other games it is one of your best projectile attacks due to good power and great versatility with range. A very tough decision right there.