Slinkman is a smart, nice, and friendly banana slug. Like a real slug, Slinkman is an invertebrate organism. Slinkman is voiced by Tom Kenny. Tom Kenny revealed that Slinkman was his favorite character that he voiced over. Murray discovered banana slugs in the Santa Cruz Mountains when he attended summer camps as a child. Murray originally created Slinkman as Lumpus's "beaten-down" assistant with a voice intended to sound "like Dustin Hoffman's Rain man." Cartoon Network's press release states that Slinkman, who "has lots of social skills, and knows the Bean Scout manual cover-to-cover and can keep up with Lumpus’ busy schedule better than Lumpus himself" and operates the camp whenever Lumpus suffers from a meltdown, does not have "enough spine to stand up for himself." As episodes entered production, Slinkman gained increasing control over Camp Kidney as Lumpus became more mentally incapacitated. As a consequence, Slinkman's voice drifted away from the Rain Man voice towards a Christian Slater voice. Murray stated that Kaz placed an eye stalk gag involving Slinkman in all of the episodes that he wrote.
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