Pak E. Derm

Pak Elephant Derm is an elephant-like creature that first appears in Yoshi's Story. Their shortened name, Pak E. Derm, is a pun on the word pachyderm, a term which is no longer in use; it refers to an obsolete taxonomic order of animals in biology that included elephants, whence Pak E. Derm's appearance was inspired.

In Super Smash Flash 2
In Super Smash Flash 2, Pak E. Derm has a cameo appeared on the stage Yoshi's Story as a background character. He was holding the sign and walking the stage then turns away for the same time.