Anuboo

Anuboo is a supspecies of Boo. Its first appearance was in Mario and Luigi: Superstar Saga, where its attack involved shapeshifting into the Mario bro it would attack, and then shooting laser out of its eyes towards that character. The trailer for Super Mario Galaxy 2 shows creatures that appear similar to anuboos after they have changed to Mario following him around; it has not been confirmed whether they are anuboo or not.