The real scoutmaster said that Lumpus locked him in the closet since the summer began. Murray decided to use the concept as a twist ending in the final episode, adding that the twist "tied up his character well." The official Cartoon Network press kit describes Lumpus as a "frustrated" and "egomaniacal" individual who "needs to have his world in complete order". "The Hollywood Reporter" reviewer Ray Richmond described Lumpus as "thin-skinned". "Common Sense Media" reviewer Joly Herman, whose review is posted on Go.com, describes Lumpus as the "primary malignant, greedy character who yells at the campers and ends up getting his in the end" and characterizes his yelling as "frightening, even if Lazlo does not take him seriously". Lumpus throws temper tantrums, complete with screaming, stomping and/or crying if his demands are not met. He wishes to become the Head Scoutmaster and feels disappointment with his current role. Lumpus has a crush on Squirrel Scout leader Ms. Jane Doe, who is oblivious to his constant attempts to take her on a date. Lumpus enjoys Doe's "Minnesota accent." Towards the end of "Camp Lazlo", Lumpus marries Jane Doe (though in one episode he was already married to a migrating mulberry tree). It was also revealed at the end of the series that Lumpus was "not" the official scoutmaster of Camp Kidney, but an imposter. The "real" scoutmaster manages to get the officers to put him in a mental hospital/cell under a straitjacket. The real scoutmaster lied because he stated that Lumpus had locked him in the closet this summer, but Lumpus has been the scoutmaster for 5 years (though it turns out he got to be scoutmaster by buying fake badges) and that the real scoutmaster may be framing Lumpus. Also, in one of the episodes, it was revealed that Scoutmaster Lumpus was given the job from his dad from the Bean Tree, which was once owned by his grandfather. However, there's a contradiction in that episode for it said Lumpus' grandfather got Camp Kidney from a descendant of the camp's founder but another episode shows the founder as still alive and still owning Camp Kidney. Lumpus would've still had his job after being arrested, due to the conclusion in the episode "Dead Bean Drop" end credits, showing that Lumpus is still scoutmaster in the future, despite the dispute that he's not the real Scoutmaster.