Spongebob Sqarepantsis a cute sea sponge, but he is drawn to resemble a kitchen sponge, being rectangular and bright yellow with a dark brown outline. In earlier episodes, he is wider near the top and gets skinnier going further down, but in more recent episodes, he is more of a regular square shape. SpongeBob has large blue eyes, a long, slightly curved nose, a large mouth with two prominent front buck teeth, and dimples with three freckles on each cheek. He typically wears a white shirt with a red tie, black leather shoes with shoelaces, and brown rectangular pants with a black belt (the entire outfit is sometimes referred to as his "pants", hence his name). While working at theKrusty Krab, he wears a tall, white hat with a small blue anchor on it as a uniform. SpongeBob sometimes sleeps in his underwear, and at other times pajamas (beginning in Season 5). Though SpongeBob has always been voiced by Tom Kenny, his voice has changed over the course of the series; his voice is lower than normal in the pilot episode, and after the movie, his voice gets slightly higher-pitched. And also, SpongeBob never passed Boating School.
SpongeBob is a very clueless, abnormal, immature, fun loving and hyperactive character with a happy-go-lucky personality. He is an extremely determined person, and will often stop at nothing to accomplish a task. He is also somewhat dramatic to the people who are kind to him, for example, to the mailfish. He is also over-confident. Sometimes, though, he shows his devious side when trying to get Mr. Krabs and Plankton to work together. He sometimes tends to make mountains out of molehills, such as losing his name tag.
SpongeBob can become scared easily and usually panics when frightened. He is afraid of the dark (or what's in the dark) and clowns. Occasionally, SpongeBob is too ignorant to notice impending danger and his unworldly thinking may put himself or others in peril. He also can't detect lies or malice information as easy as the other characters, mainly due to his naive nature.