Thanatos (Endless Ocean: Adventures of the Deep)

Thanatos is the name of a monstrous (and perhaps even supernatural in nature) great white shark that constantly pursues the player character in Endless Ocean: Adventures of the Deep (Endless Ocean: Blue World in North America). Though this gigantic shark is not vocal about his motives (being a shark, of course), he displays an unusual hunger for chasing and attacking the player all throughout the story.

Appearance
Though Thanatos is assumed to be a relative of the Great White shark based upon his appearance, his species is unknown, as he is far larger than any other Great White (and any other kind of shark that appears in the game, on that note). As well as this, he has a darker colouration than the normal grey of a Great White, though his belly is still pale. The places on his body where the dark upper-body colour blends into the pale belly colour are uneven, almost spotted or patchy-looking, and his fins appear to be larger than the proportions of a Great White would normally allow, as well as being somewhat ragged-looking. He is covered with scars from countless battles, as he often attacks boats and other creatures (thus provoking a response in the form of a counterattack, wounding the creature).

Mannerisms
This shark is a vicious creature, feared throughout the Agean Sea in his resident video game for his aggressive and violent nature. This is reflected in his tendency to go out of his way to attack the player character, as is seen multiple times in the main story and even when encountered in his natural territory. It is reported that he is extremely cunning, evading capture after years of attempts upon his life and freedom. He is said to be seen in waters all over the world, but only rarely, and is feared by all who know of him.

It is said by one of the supporting characters in the game that Thanatos seems to have a particular taste for the player character, even noting that "it seems like he's got a liking on you". This is strange, considering that Thanatos's viciousness usually seems to be universal, but it is likely just an explanation for the shark's A.I. only being programmed to target the player character and not other divers.

Thanatos shakes off the effects of the Pulsar, a healing device that also calms aggressive animals down in-game, very quickly, making it very difficult to get close enough to focus on him in order to obtain his in-game information (for cataloguing uses) or to take a picture of him. He is one of two creatures that does this, the other being a deformed Goblin-Shark-like creature called Okeanos's Guardian.