<Li> The Red Baron, is the nemesis Snoopy fights while in the guise of a World War I Flying Ace complete with goggles, helmet and scarf . The battles occur while Snoopy is perched on his doghouse that becomes his Sopwith Camel plane through the power of his imagination . The battles between Snoopy and the Red Baron began in an October 10, 1965 Peanuts strip . </Li> <Li> The Head Beagle, an unseen character first mentioned when Frieda reports Snoopy to him (for not chasing rabbits) in October 1969 . (Snoopy himself serves as Head Beagle from February to March 1970 .) </Li>

What are the characters names in charlie brown