A radionic engineer who later went mad

"Human beings have destroyed this world, and I will have no further part of it. No, sir, I am a Woodchuck now."

Real name unknown, supposed to have been a human that renounced his humanity to Become a Proper and Potent Rodent.

"You'd make a Mighty Poor Woodchuck," he used to chastise potential students, before informing them they ought to try a less strenuous profession, like Squirreling or Badgering; and, besides, "we don't have school here," said Mister Woodchuck, as if proud of the fact.

And those cryptic final words: "YOU ARE RODENT! GUARD YOUR NEST!"