Cthulhu

was originally devised by author, as an evil god from beyond the human universe. The creature is a popular element of today.

In Terraria, a number of enemies and items include references to Cthulhu:

Bosses

 * - One of the first bosses that will be faced by the player.
 * - The Pre-hardmode exclusive boss of The Crimson. In addition to this, the official game lore mentions that while the mechanic has almost finished recreating Cthulhu, his complete restoration would require a brain. The brain in question is, obviously, Brain of Cthulhu, one of the vital organs ripped off when he was defeated.
 * The pre-hardmode boss that guards the entrance to the Dungeon-
 * The Destroyer, The Twins, and Skeletron Prime - According to official Game Lore, the Mechanic was forced by the Lunatic Cultist to rebuilt a mechanical version of Cthulhu to replace the vital organs that were ripped from him before his disappearance. It can be safety assumed that these three mechanical bosses are the mechanical parts of Cthulhu's organs.
 * - The final boss in the game. Resembles common depictions of Cthulhu

Enemies

 * - A minion summoned by Eye of Cthulhu.
 * - An invincible enemy summoned by Moon Lord.
 * - Summoned by Lunatic Cultist, this enemy resembles Cthulhu's (Or Moon Lord's) head.

Items (All are references to Eye of Cthulhu)

 * - A post-plantera yoyo dropped by Mothron during a Solar eclipse
 * - Expert Mode exclusive drop of EoC
 * - One of Angler's potential quests. It more likely refers to the Demon Eyes, as the EoC is too large to become a fish of that size.

Miscellaneous

 * - A massive Sharknado (thus the name) summoned by Duke Fishron.

Trivia

 * In the concept art, he is missing one of his eyes, presumably because the missing eye became the Eye of Cthulhu boss.
 * One of the title messages on the refers to this: "Cthulhu is mad...and is missing an eye!"

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