Big Lenny is a minor antagonist in Nickelodeon's SpongeBob SquarePants TV Series. He is a massive, vicious, and all-around hostile Jellyfish. As per notoriety on Lenny, he is among the most phenomenally feared creatures to roam the ocean. He is the archenemy of Dr. Manowar.
Big Lenny, as implied by his namesake, is an extremely large Jellyfish with a dark red top complimented by a frilled brim as well as other notable features. In terms of general anatomy, Lenny has a human-like face with prominent creasings and 10 long tentacles. His face is also depicted by Dr. Manowar's best rendering to be worn in an almost constant sinister scowl, indicating his cruel nature.
Personality
True to the accounts of his fearsome reputation, Big Lenny is a vicious, deadly, seamlessly hostile, and all-around cruel Jellyfish. He is well implied to demonstrate exceptional sadism in his behavior, as he is known to target and try to kill people by stinging them with his venom proven to be fatal. To emphasize his callousness, he is not implied to discriminate with his intended targets, extending to basically anything or anyone unfortunate enough to find him in their way.
Despite the lack of general information given on him, Lenny is altogether confirmed to have a clear adverse and sadistic pattern of behavior. He is also known to be extensively territorial, as his hostile pursuits of course blend with his hobby of constantly prowling his claimed turf.
Biography
Although Big Lenny is a legend among Jellyfish in his own way, not much is revealed about him apart from the accounts given by Jellyfishing enthusiasts. True to his notoriety however, most if not all of them emphasize him to perhaps be the most dangerous Jellyfish on the seabed. To emphasize the horrific implications given on Lenny, SpongeBob even cites the Jellyfishing expert Dr. Manowar to be the only known person to survive his deathly sting, the impact of such having left him a large and painful welt still freshly visible to date.
Trivia
Although not confirmed, it's heavily implied that Big Lenny was a Box Jellyfish due to the real world species having a similar lethality rate to Big Lenny's attacks, with the only known person to survive a severe Box Jellyfish attack being then-10-year-old Rachael Shardlow back in 2010.
