Desudasu

A skull-type imp (with a chalk-white body, dark blue horns, red eyes and pale-yellowish teeth) who first appeared in the form of Petra Fina's Petra-Stamp, which enabled her turn any Time Shifter into a slave. His presence was soon revealed when he was awaken to replace Super Ninja and take over Petra Fina's group. He can headbutt Time Shifters for Petra Fina to control. Can possess people (he once possessed Merlock) and assume a giant demonic "Con" form. In the original Japanese version, he ends his sentences with "-dasu".

from wikipedia