Grover Underwood is a fictional character in Rick Riordan's Percy Jackson and the Olympians stories. He is a satyr, a mythological Greek being that is half goat and half human. He has the upper body of a human and the legs and horns of a goat.

He uses fake feet when he wants to look like a human. His horns are usually hidden by his curly brown hair (although they do eventually grow too tall for him to hide them) and sometimes an orange rasta cap. Although he is 32, he is the equivalent of a sixteen year-old human because satyrs mature half as fast as humans do.

Grover is set to be played by Brandon T. Jackson in the upcoming movie Percy Jackson & the Olympians: The Lightning Thief , a film adaptation of the first book in the series, The Lightning Thief. Grover is the best friend of Percy Jackson, with whom he has an empathy link, meaning if one of the two dies, the other will probably die, too (or permanently left in a vegetative state).

Grover is shown to be a bit cowardly, getting afraid easily. When this happens, his eyes turn to slits like a goat's and he starts eating furniture, but he always tries to defend his friends and is very loyal. He also can cope with dangerous situations fairly well, for example, when he was kidnapped by Polyphemus the cyclops.

Being a satyr, Grover loves nature very much and hates pollution and hunters. In the third book, it is revealed he has a huge crush on Artemis, the goddess of the hunt. He comments, "She's so...into nature." Grover's girlfriend is a nymph named Juniper.

They are first shown together in The Battle of the Labyrinth. Strangely, he once had a crush on a blueberry bush, and often helps out animals.

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