Rudy is the name of the Fire Dragon that Kary allegedly summoned from the depths of hell. Rudy attempted to help the Light Warriors through Gurgu Volcano by providing them with fire armor made from his scales but was killed by Red Mage (who Rudy had swallowed in defense upon being attacked) by an Ice spell before Rudy could make more than one set of armor.
Rudy is a very kind and well educated dragon who is willing to aid the Light Warriors on their trip through Gurgu Volcano. However, he does not take kindly to any form of attack as when Red Mage attempted to fight him Rudy ate RM. This apparently was a retaliation as he "came after me with magic and steel".