This Kookith appears to be the Petpet of the Lab Ray Scientist, and runs a similar laboratory for Petpets, hidden behind his master's walls. However, the Petpet Lab Ray seems to be a little less high tech than the Neopet one.
Eeeee hee hee hee!
Hee hee hee! Look at them go! You'll never be able to catch them all.
His name was revealed in a Better Than You contest.