Here's a detailed description of a cartoon alien based on your specifications:

Name: Gleepglorp (This is a suggestion, feel free to rename)

Physical Description: Gleepglorp is a large, rotund alien with vibrant green skin covered in thick, shaggy fur. His considerable girth is supported by eight sturdy legs, each ending in three clawed toes. From his bulbous head sprout four long, flexible antennae, which twitch and wiggle constantly. His face is dominated by a remarkably long, fleshy nose that droops slightly at the tip. Two pairs of large, expressive eyes, one pair above the other, peer out from under his furry brow. Each of his four hands boasts twelve long, slender fingers, perfect for manipulating small objects or perhaps playing a complex alien instrument. A short, bushy tail completes his unusual physique, wagging rhythmically as he moves.

Personality (Inferred): Given his physical characteristics, Gleepglorp might be portrayed as a gentle giant, perhaps a bit clumsy due to his size and multiple limbs. His expressive eyes suggest a curious and friendly nature. The constant movement of his antennae could indicate a nervous or playful disposition.

Possible Backstory Elements: Gleepglorp could be from a planet with a dense, humid atmosphere, explaining his thick fur. His multiple limbs and fingers might be an adaptation to his planet's unique environment, allowing him to navigate complex terrain or operate intricate machinery. His long nose could be a sensory organ, detecting subtle changes in the air or pheromones.

Possible Abilities: Gleepglorp's multiple limbs could grant him exceptional dexterity and strength. His antennae might be sensitive to vibrations or electromagnetic fields. His large eyes could suggest superior night vision or the ability to perceive a wider range of colors.

Style: Gleepglorp's design leans towards a cute and slightly goofy aesthetic, despite his unusual features. His large size and multiple limbs could be exaggerated for comedic effect. The color palette could be vibrant and playful, emphasizing the green of his skin and the contrast with his fur.

This detailed description provides a solid foundation for creating a visual representation of Gleepglorp. An artist could use this description to create a unique and memorable cartoon alien character.