Blasto appears in Stages 6, 9, and 11. It slowly moves back and forth, minding its own business. If Kirby hits it twice, it is defeated and drops a Crash item; this detonates upon contact with Kirby and the resulting explosion melts all nearby Metal Blocks. This is required to clear multiple rounds in the game.
Captain Stitch looks extremely similar to Blasto due to the expressions it makes, right down to changing color when it is damaged. The later enemies Blado and Searches also bear a resemblance to it, with the latter even capable of blasts that may be akin to Blasto leaving behind a Crash item.